992 Carrera S/4S/GTS

AP Racing Radi-CAL 380mm Competition Brake Kit GT4 (Rear) Fit The Following Cars Porsche 992 911 Carrera Base / Carrera 4 Porsche 992 911 S/4S/GTS (Iron and PCCB) Complete rear AP Racing Radi-CAL Competition Brake Kit. Fits all variants of the Porsche 992 911 Carrera base and Carrera 4. Eliminates the need to remove the caliper for pad changes Retains OEM parking brake functionality Saves 18 unsprung lbs. vs. OEM iron brakes and weighs almost the same as the OEM PCCB system Jewel-like ENP caliper finish is incredibly durable and easy to clean AP Racing Radi-CAL with durable, ventilated stainless steel pistons (no ceramic piston caps to break) with anti-knockback springs Allows for the preservation of pricey OEM brake components Huge array of brake pad options from all major pad manufacturers Fits OEM 20" wheels without spacer 380x32mm, 72 vane AP Racing disc fits inside popular 19" wheels Every component designed to resist the heat of extended track sessions Pistons sized properly to allow for seamless integration with OEM master cylinder and ABS system Includes pad tension kit (eliminates noise) and disc burning at no additional cost Designed to work with Ap Racing front Brake Kit

AP Racing Radi-Cal 372mm Competition Brake Kit for Porsche (Front) Fit The Following Cars Porsche 991 Carrera S/4S/GTS (PCCB and Iron Rotors) Porsche 992 Carrera base / Carrera 4 (Iron Rotors) Complete front AP Racing Radi-Cal Competition Brake Kit for Porsche features; Features AP Racing Radi-Cal 9669 calipers with option for 25mm (1 inch) thick pads for extreme durability! Jewel-like ENP Caliper finish is incredibly durable and easy to clean 372x34mm iron discs are resilient under heavy track use, and replacements cost one tenth of PCCB ($600 vs. $6,000 per disc) Shaves over 20 lbs. off the front axle vs oem iron brakes Only adds approximately one pound per side of unsprung weight vs. the OEM PCCB setup Fits inside 19" wheels, which the OEM PCCB discs cannot do, allowing for additional unsprung weight reduction plus improved tire options Our AP Racing Radi-Cals feature a removable bridge, making pad swaps far faster and easier than stock calipers Commonly available AP Racing pad shapes provide a wide selection of brake pad choices to tailor system feel and performance Removing the stock calipers and PCCB discs allows them to be preserved undamaged, retaining the vehicle's future resale value AP systems typically trade hands on the used market at 65% or more of their original MSRP, lowering the long-term cost of ownership. Use them for a few years and recoup a large portion of your initial investment. Designed to work with our matching 365mm Radi-Cal brake kit.

AP Racing Road 380mm Road Brake Kit for Porsche (Front) Fit The Following Cars Porsche 991 Carrera S/4S/GTS (PCCB and Iron Rotors) Porsche 992 Carrera Base / Carrera 4 (PCCB and Iron Rotors) Complete front AP Racing Road Brake Kit for Porsche 991 and 992 911 features; Features AP Racing Radi-Cal 9562 calipers. Available with Black, Red, or Silver Calipers Takes your brakes into GT3 territory with huge 380x36mm, 72 vane AP Racing J Hook discs Painted calipers with dust boots add durability in inclement weather conditions Low noise, vibration, and harshness for a very OE-like experience during daily driving Leverages six piston AP Racing CP9562 World Radi-CAL II calipers with a red, black, or silver painted finish Utilizes large volume brake pads for heat absorption and longevity Pistons sized properly to maintain proper brake bias and work with the OEM master cylinder and ABS system Designed to mate with OEM rear brakes or our matching rear AP Racing Road Brake Kit

AP Racing Radi-Cal 365mm Competition Brake Kit for Porsche (Rear) Fit The Following Cars Porsche 992 Carrera Base and Carrera 4 (PCCB and Iron Rotors) Porsche 992 911 S/4S/GTS (PCCB and Iron Rotors) Complete front AP Racing Radi-Cal Competition Brake Kit for Porsche 992 911 features; Features AP Racing Radi-Cal 9449 calipers  Jewel-like ENP Caliper finish is incredibly durable and easy to clean 365x30mm iron discs are resilient under heavy track use, and replacements cost one tenth of PCCB ($600 vs. $6,000 per disc) Shaves up to  9lbs. off the rear axle vs oem iron brakes Only adds approximately one pound per side of unsprung weight vs. the OEM PCCB setup Fits inside 19" wheels, which the OEM PCCB discs cannot do, allowing for additional unsprung weight reduction plus improved tire options Our AP Racing Radi-Cals feature a removable bridge, making pad swaps far faster and easier than stock calipers Commonly available AP Racing pad shapes provide a wide selection of brake pad choices to tailor system feel and performance Removing the stock calipers and PCCB discs allows them to be preserved undamaged, retaining the vehicle's future resale value AP systems typically trade hands on the used market at 65% or more of their original MSRP, lowering the long-term cost of ownership. Use them for a few years and recoup a large portion of your initial investment. Designed to work with our matching Front Radi-Cal brake kit.

AP Racing Road 380mm Road Brake Kit for Porsche (Rear) Fit The Following Cars Porsche 991 Carrera S/4S/GTS (PCCB and Iron Rotors) Porsche 992 Carrera / Carrera 4 (PCCB and Iron Rotors) Complete front AP Racing Road Brake Kit for Porsche 991 and 992 911 features; Takes your brakes into GT3 territory with huge 380x28mm, 48 vane AP Racing J Hook discs Retains full function of OEM parking brake Painted calipers with dust boots add durability in inclement weather conditions Low noise, vibration, and harshness for a very OE-like experience during daily driving Leverages four piston AP Racing CP9541 World Radi-CAL II calipers with a red, black, or silver painted finish Pistons sized properly to maintain proper brake bias and work with the OEM master cylinder and ABS system Designed to mate with the front AP Racing Road Brake kit Weighs roughly the same as an OEM rear rear brake setup despite a huge size increase of the rotor size to 380mm

Girodisc Porsche 390mm Rear Rotors Upgrade your Porsche’s braking system with Girodisc’s 390mm rear iron rotors, designed as a direct replacement for OEM PCCB (carbon-ceramic) discs. This conversion provides improved heat capacity, consistent braking performance, and drastically lower maintenance costs—all while maintaining factory fitment and ABS compatibility. Direct Iron Replacement for Porsche PCCB Rotors The Girodisc system bolts directly to the car and works seamlessly with OEM calipers and pads. Each rotor features a CNC-machined 6061-T6 aluminum hat and Girodisc’s proprietary high-carbon cast iron friction rings, all made in the USA. The floating two-piece design allows for controlled expansion under heat, preserving pad contact and consistent pedal feel. The curved vane design acts as a centrifugal pump, pulling cooling air through the disc for maximum thermal efficiency during hard use. Features • Direct replacement for OEM Porsche PCCB 390mm rear rotors• Billet 6061-T6 aluminum hats with hard-anodized finish• Proprietary high-carbon cast iron rings cast and machined in the USA• Floating mount system with 12 cadmium-plated steel drive pins• Anti-noise spring washers eliminate rattle while maintaining float• Curved internal vanes maximize airflow and cooling• Fully rebuildable—replace only the iron rings when worn• Sold/priced per pair Girodisc A2-156 Rear Rotor FAQs: Can these rotors replace Porsche PCCB carbon-ceramic discs directly? Yes. The Girodisc 390mm system is a direct bolt-on replacement designed to work with the original PCCB calipers and hardware. What are the advantages of switching to iron rotors? Iron rotors provide more consistent performance at high temperatures, improved pedal feel, and drastically reduced replacement cost compared to OEM carbon-ceramics. Do these rotors affect the car’s ABS or stability systems? No. Girodisc rotors maintain factory dimensions and mass distribution, ensuring full electronic compatibility. How do they perform on track? Expect stable pedal feedback, greater resistance to fade, and predictable braking behavior throughout long sessions, especially when paired with performance pads and high-temperature fluid. Experience superior control and serviceability with Girodisc’s 390mm rear iron rotors—built for Porsche performance enthusiasts who demand reliability, precision, and track-ready braking confidence.

 Girodisc Porsche 410mm Front Rotors The Girodisc 410mm Front Rotors for Porsche 991 and 992 models deliver exceptional braking performance and longevity without the downsides of heavy carbon ceramics. Designed as a direct replacement for the OE discs, these rotors maintain factory brake bias and ABS efficiency while allowing a broader range of high-performance pad choices. Lightweight, Track-Proven Replacement Rotors This system is a direct replacement for the factory iron rotors, provided you use the same pad shape found on 991/992 GT3 and Turbo models equipped with iron brakes. The smaller annulus (pad swept height) versus PCCB pads reduces weight and expands your pad selection options, while still delivering exceptional heat management under demanding track conditions. Features The central hat section is machined from U.S.-sourced 6061-T6 aircraft-grade aluminum for maximum strength and minimal unsprung mass. The rotor rings are made from Girodisc’s proprietary cast iron, poured and fully machined in-house in the USA. Each rotor features a curved vane design that acts as a centrifugal pump to move cooling air efficiently through the disc, reducing heat fade and extending pad life. The floating mount system uses 12 high-strength alloy steel drive pins, cadmium plated for corrosion resistance and secured with class 12.9 cap screws and hardened washers. Anti-noise spring washers allow the rotors to expand under heat while eliminating the rattle typically associated with floating systems. This floating design also lets the rotor self-center between the pads for consistent pedal feel and reduced drag. Once the Girodisc system is installed, future rotor service is simple—only the iron rotor rings need replacement when worn, keeping your long-term costs and downtime low. FAQs: Porsche 410mm Front Rotors Do these rotors fit PCCB-equipped cars? Yes, but you must use the smaller pad shape from 991/992 GT3 or Turbo models originally fitted with iron brakes. The PCCB pads are too large for these discs. Will these rotors affect my ABS or brake bias? No, Girodisc designs their rotors to maintain the factory brake balance and ABS performance of your Porsche. How much lighter are these than OEM rotors? The weight varies by application, but Girodisc rotors typically save several pounds per corner, reducing rotational and unsprung weight for sharper handling and acceleration. Do I need special hardware to install them? No modifications are needed. The Girodisc rotors bolt directly to your car and work with your OEM calipers and mounting hardware. Can I reuse the aluminum hats when replacing rotors? Yes — the system is designed so that when the iron rings reach end of life, you can simply install new rings onto the existing hats. Upgrade your Porsche’s stopping power and feel with the precision-engineered Girodisc 410mm Front Rotors — built for drivers who demand race-level performance on both street and track.

AP Racing 350x28mm 2-piece J Hook Rear Floating Racing Brake Rotors Fit The Following Cars (w/ OEM Iron Rotors) Porsche 992 S/4S/GTS  AP Racing 2-piece Competition J Hook front disc pair for  with iron discs 350mm x 28mm (13.78" x 1.10") 72 Vane, D66 Huge increase in airflow, cooling capacity, and durability vs. OEM discs Saves 2 lbs. unsprung weight per side vs. OEM iron discs Designed for: club racing, time trial, auto-x, HPDE Works with OEM calipers, no modifications required Ultralight, fully floating, anodized billet aluminum hat with float control/anti-rattle clips Sold/priced per pair. AP Racing J Hook Brake Rotors – The Gold Standard in Track Day & Racing Performance Engineered for professional motorsport, HPDE, and dedicated track day use, AP Racing’s J Hook Brake Rotors deliver uncompromising performance, thermal stability, and consistent braking power. These two-piece, floating rotors are built to handle the extreme demands of road racing, with design features derived from over 50 years of elite competition—including Formula 1, NASCAR, and IMSA. Unlike conventional one-piece rotors, AP Racing’s two-piece floating design features a billet aluminum hat mated to a cast iron disc via precision-engineered bobbins. This setup allows for controlled radial expansion under high heat, minimizing distortion and coning. The result? More even pad wear, a firmer pedal feel, and longer component life, even during extended lapping sessions or endurance racing. Floating hardware includes anti-knockback spring clips that reduce piston retraction while eliminating common NVH issues like rattling. Why Choose AP Racing J Hook Rotors? Advanced Cooling, Superior Bite, Unmatched Durability At the heart of every rotor is AP Racing’s proprietary high-carbon iron alloy, developed to withstand repeated thermal cycling without cracking or warping. Internally, directional vanes—far superior to OEM pillar or straight vane designs—maximize airflow and cooling. With 60 to 84 vanes per rotor, AP Racing achieves faster heat evacuation, reduced brake fade, and a more consistent friction surface. These rotors are left/right-specific for optimal airflow and balance. The exclusive J Hook slot pattern offers enhanced initial bite and promotes uniform heat distribution across the rotor face, reducing pad deposits and vibration. Unlike drilled rotors or straight-slot competitors, the J Hook design provides cleaner pad transfer during bed-in and superior modulation under braking—ideal for serious drivers who demand feedback and control. Yes, you might hear a little more whirr, but you’ll gain the stopping power, consistency, and longevity your lap times demand. Premium Components, Affordable Performance The rotor hats are CNC-machined from 6061-T6 billet aluminum and hard anodized for strength and heat resistance. Scalloped edges under the hat further assist heat dissipation. All hardware is U.S.-made to AP Racing spec, the same quality found on pro-level racing platforms. And while these rotors are race-proven, they’re also surprisingly cost-effective to replace. Don’t settle for cheap rotors that crack after a weekend—AP’s J Hook rings offer better durability and real long-term value. Fewer replacements mean more track time, less downtime, and peace of mind knowing you're running the best. Used by Champions. Trusted by Experts. From endurance racers to HPDE enthusiasts, AP Racing brake rotors are trusted worldwide for their reliability, longevity, and performance under pressure. Whether you're shaving seconds off your lap time or building a dedicated track car, the J Hook delivers a professional-grade solution that won’t let you down.   AP Racing J Hook Brake Rotors for Auto Racing, Track Days & HPDE Why Rotor Design Matters: Heat Expansion and Floating Technology As with most metals, iron brake discs expand significantly under heat. When temperatures rise, the disc grows radially—expanding in both diameter and circumference. Traditional one-piece rotors struggle to accommodate this natural expansion. As the outer edge pulls away from the center under heat stress, it creates a condition called “coning”—a distortion that compromises pad-to-rotor contact. This distortion can lead to uneven pad wear, brake tapering, and an inconsistent, long brake pedal. AP Racing two-piece floating brake rotors are purpose-built to eliminate these issues. Engineered with “float” built into the disc or hat assembly, these rotors feature oblong-shaped mounting holes that allow the hardware to slide as the disc heats up. This flexibility ensures the disc runs true within the caliper under high-temperature loads, effectively reducing distortion, minimizing pad taper and stress cracks, and promoting longer component life. Custom Mounting Hardware & Anti-Knockback Spring Clips AP Racing rotors utilize application-specific, U.S.-made mounting hardware—not generic bolts. These premium components are the exact parts used in AP’s professional motorsport products, engineered to withstand the rigors of competitive racing. To manage lateral disc motion that can push caliper pistons backward (known as knockback), AP Racing integrates anti-knockback spring clips on alternating bobbins—five on a ten-bolt setup, six on a twelve-bolt disc. These clips keep the aluminum hat and iron disc ring properly aligned while still allowing for radial float. Bonus: they eliminate annoying rattles and vibrations, ensuring a quieter, more refined braking experience. High-Performance Hat Design for Heat Isolation The disc hats in AP Racing’s two-piece floating rotors are CNC-machined from 6061-T6 billet aluminum and finished with a hard anodized coating. This high-strength aluminum alloy was selected for its ability to maintain structural integrity even at elevated temperatures. AP adds scalloped channels beneath the hat to further encourage airflow and heat evacuation from the outer disc face, minimizing thermal transfer to hubs and wheel bearings—helping reduce maintenance costs on these expensive components. Internal Vane Engineering: Airflow Optimization & Thermal Stability AP Racing’s internal vane design sets them apart from OEM and most aftermarket competitors. While many factory brake discs use non-directional pillar vanes (low-cost and NVH-focused), AP Racing rotors use directional vanes engineered for maximum airflow. These rotors are side-specific—meaning you’ll receive a unique left and right disc in each set—ensuring optimized cooling through strategic vane orientation and shape. Beyond that, AP Racing rotors feature a superior vane count, typically ranging from 60 to 84 vanes, compared to 30–48 in most aftermarket rotors. After extensive CFD and thermal analysis, this high vane count was proven to: Increase airspeed and thermal transfer Reduce recirculation and deflection at the disc face Minimize coning, cracking, and brake fade Deliver more even pad contact and extended rotor life J Hook Slot Pattern: Exclusive to AP Racing Slots and drill holes may improve initial bite, but they also introduce “cool spots” in the rotor face—areas of uneven heating that can lead to stress risers, cracks, and pad vibration. OEM rotors often avoid this by leaving the disc face blank, but that compromises bite and brake feel. AP Racing’s patented J Hook design, developed through rigorous R&D, solves this problem. The hooks are meticulously spaced around the disc’s circumference and from hat to edge, forming a continuous distortion path that ensures even heat distribution. This encourages uniform pad deposits during bed-in, helps reduce judder and cracking, and improves consistency under repeated high-load braking. In addition, the J Hook slots provide more leading edges for pads to grip than traditional curved slots or blank rotors. While this might generate a mild whirring sound during braking, the benefits—more bite, cleaner bedding, better pedal feel—make it the top choice for committed racers and serious track day drivers. Metallurgy Backed by 50+ Years of Motorsport Leadership AP Racing's reputation is built on performance, and their proprietary iron alloy used in J Hook rotors is no exception. Drawing from over five decades of elite motorsport experience, including 750+ Formula 1 wins and widespread use across NASCAR, AP’s engineers have developed a disc alloy that excels under sustained racing temperatures and stress. Where OEM discs focus on affordability and mass production, AP Racing’s J Hook rotors are purpose-built for motorsport durability and heat resistance. Affordable Replacement Cost: Serious Value for Serious Drivers Even the best brake rotors are consumables. When you drive hard—especially at the track—your discs will eventually wear out. That’s why AP Racing designed their replacement iron rings to be cost-effective, allowing you to replace worn parts without breaking the bank. Compare that to constantly buying cheap $150 rotors every weekend—rotors that can't handle the heat and need to be swapped frequently. With AP Racing’s J Hook rotors, you get longer service intervals, less downtime, and better performance over time, making them an incredibly smart long-term investment. Proven on Track. Trusted by Champions. Top-tier racing teams rely on AP Racing J Hook rotors for one reason: they perform under pressure. Whether you're running time trials, attending HPDE events, or competing in wheel-to-wheel racing, these rotors offer professional-grade reliability, safety, and performance. Bedding and preparation of AP Racing J Hook Disc Properly preparing your new brake discs before heavy use is extremely important. The goal of bedding-in your brake pads and discs is to mate them together properly and prepare them for heavy use.  When prepared properly, or bed-in, your pads will transfer a thin layer of material to the disc face (transfer layer).  The pads in your caliper will then actually ride on that thin layer of pad material you’ve put down on the rotor, rather than rubbing directly on the iron rotor face.  A good transfer layer is going to give you superior brake pedal feel, less noise, superior pad wear, and lower the chances of cracking your discs. Important Notes- PLEASE READ! First, make sure you are on a closed course to perform a proper bed-in.  Do NOT perform the procedure on public roads.  You need a stretch of asphalt with long straights, good visibility, and no potential obstructions.  Make sure you are in a position to safely and repeatedly attain the necessary speeds to perform the bed-in procedure.  A controlled racetrack is the best place to perform this procedure.  AP Racing and Competition Motorsport in no way suggest or condone speeding on public roads or breaking the law in your car, nor do we take responsibility for any damage or injury that occurs as a result of using our product or these procedures.  You are performing the bed-in procedure at your own risk.  During these procedures, it’s critical that you never come to a complete stop with your foot on the brake pedal.  If you have brake ducts on your car, you may want to block them off to allow your brake system to heat up easily. The procedure outlined below is a generic procedure for most types of mild race pad.  Please check your pad manufacturer’s recommended bed-in procedure. Accelerate to approximately 60mph and then decelerate down to 5 mph.  If your car has ABS, you should try to hold the brakes at a point just before ABS intervention.  Once the car slows to 5mph, immediately accelerate back up to about 60mph, and brake again to roughly 5mph.  Repeat this series of stopping and accelerating 8 to 10 times.  Again, do not come to a complete stop with your foot on the brake pedal. Cool the brake system down by cruising at 45mph+ for 5 to 10 minutes. Visually inspect your discs.  They should be a blue/grey color (instead of shiny silver), and have an even layer of pad material across and around the entire rotor face. If the AP Racing rotors don’t have a layer of pad material on them, perform another series of stops in the manner outlined above.

AP Racing 350x34mm 2-piece J Hook Front Floating Racing Brake Rotors Fit The Following Cars (w/ OEM Iron Rotors) Porsche 991 S/4S/GTS (Front) Porsche 992 S/4S/GTS (Front) AP Racing 2-piece Competition J Hook front disc pair for  with iron discs 350mm x 34mm (13.78" x 1.34") 72 Vane, D66 Huge increase in airflow, cooling capacity, and durability vs. OEM discs Saves 2 lbs. unsprung weight per side vs. OEM iron discs Designed for: club racing, time trial, auto-x, HPDE Works with OEM calipers, no modifications required Ultralight, fully floating, anodized billet aluminum hat with float control/anti-rattle clips Sold/priced per pair. AP Racing J Hook Brake Rotors – The Gold Standard in Track Day & Racing Performance Engineered for professional motorsport, HPDE, and dedicated track day use, AP Racing’s J Hook Brake Rotors deliver uncompromising performance, thermal stability, and consistent braking power. These two-piece, floating rotors are built to handle the extreme demands of road racing, with design features derived from over 50 years of elite competition—including Formula 1, NASCAR, and IMSA. Unlike conventional one-piece rotors, AP Racing’s two-piece floating design features a billet aluminum hat mated to a cast iron disc via precision-engineered bobbins. This setup allows for controlled radial expansion under high heat, minimizing distortion and coning. The result? More even pad wear, a firmer pedal feel, and longer component life, even during extended lapping sessions or endurance racing. Floating hardware includes anti-knockback spring clips that reduce piston retraction while eliminating common NVH issues like rattling. Why Choose AP Racing J Hook Rotors? Advanced Cooling, Superior Bite, Unmatched Durability At the heart of every rotor is AP Racing’s proprietary high-carbon iron alloy, developed to withstand repeated thermal cycling without cracking or warping. Internally, directional vanes—far superior to OEM pillar or straight vane designs—maximize airflow and cooling. With 60 to 84 vanes per rotor, AP Racing achieves faster heat evacuation, reduced brake fade, and a more consistent friction surface. These rotors are left/right-specific for optimal airflow and balance. The exclusive J Hook slot pattern offers enhanced initial bite and promotes uniform heat distribution across the rotor face, reducing pad deposits and vibration. Unlike drilled rotors or straight-slot competitors, the J Hook design provides cleaner pad transfer during bed-in and superior modulation under braking—ideal for serious drivers who demand feedback and control. Yes, you might hear a little more whirr, but you’ll gain the stopping power, consistency, and longevity your lap times demand. Premium Components, Affordable Performance The rotor hats are CNC-machined from 6061-T6 billet aluminum and hard anodized for strength and heat resistance. Scalloped edges under the hat further assist heat dissipation. All hardware is U.S.-made to AP Racing spec, the same quality found on pro-level racing platforms. And while these rotors are race-proven, they’re also surprisingly cost-effective to replace. Don’t settle for cheap rotors that crack after a weekend—AP’s J Hook rings offer better durability and real long-term value. Fewer replacements mean more track time, less downtime, and peace of mind knowing you're running the best. Used by Champions. Trusted by Experts. From endurance racers to HPDE enthusiasts, AP Racing brake rotors are trusted worldwide for their reliability, longevity, and performance under pressure. Whether you're shaving seconds off your lap time or building a dedicated track car, the J Hook delivers a professional-grade solution that won’t let you down.   AP Racing J Hook Brake Rotors for Auto Racing, Track Days & HPDE Why Rotor Design Matters: Heat Expansion and Floating Technology As with most metals, iron brake discs expand significantly under heat. When temperatures rise, the disc grows radially—expanding in both diameter and circumference. Traditional one-piece rotors struggle to accommodate this natural expansion. As the outer edge pulls away from the center under heat stress, it creates a condition called “coning”—a distortion that compromises pad-to-rotor contact. This distortion can lead to uneven pad wear, brake tapering, and an inconsistent, long brake pedal. AP Racing two-piece floating brake rotors are purpose-built to eliminate these issues. Engineered with “float” built into the disc or hat assembly, these rotors feature oblong-shaped mounting holes that allow the hardware to slide as the disc heats up. This flexibility ensures the disc runs true within the caliper under high-temperature loads, effectively reducing distortion, minimizing pad taper and stress cracks, and promoting longer component life. Custom Mounting Hardware & Anti-Knockback Spring Clips AP Racing rotors utilize application-specific, U.S.-made mounting hardware—not generic bolts. These premium components are the exact parts used in AP’s professional motorsport products, engineered to withstand the rigors of competitive racing. To manage lateral disc motion that can push caliper pistons backward (known as knockback), AP Racing integrates anti-knockback spring clips on alternating bobbins—five on a ten-bolt setup, six on a twelve-bolt disc. These clips keep the aluminum hat and iron disc ring properly aligned while still allowing for radial float. Bonus: they eliminate annoying rattles and vibrations, ensuring a quieter, more refined braking experience. High-Performance Hat Design for Heat Isolation The disc hats in AP Racing’s two-piece floating rotors are CNC-machined from 6061-T6 billet aluminum and finished with a hard anodized coating. This high-strength aluminum alloy was selected for its ability to maintain structural integrity even at elevated temperatures. AP adds scalloped channels beneath the hat to further encourage airflow and heat evacuation from the outer disc face, minimizing thermal transfer to hubs and wheel bearings—helping reduce maintenance costs on these expensive components. Internal Vane Engineering: Airflow Optimization & Thermal Stability AP Racing’s internal vane design sets them apart from OEM and most aftermarket competitors. While many factory brake discs use non-directional pillar vanes (low-cost and NVH-focused), AP Racing rotors use directional vanes engineered for maximum airflow. These rotors are side-specific—meaning you’ll receive a unique left and right disc in each set—ensuring optimized cooling through strategic vane orientation and shape. Beyond that, AP Racing rotors feature a superior vane count, typically ranging from 60 to 84 vanes, compared to 30–48 in most aftermarket rotors. After extensive CFD and thermal analysis, this high vane count was proven to: Increase airspeed and thermal transfer Reduce recirculation and deflection at the disc face Minimize coning, cracking, and brake fade Deliver more even pad contact and extended rotor life J Hook Slot Pattern: Exclusive to AP Racing Slots and drill holes may improve initial bite, but they also introduce “cool spots” in the rotor face—areas of uneven heating that can lead to stress risers, cracks, and pad vibration. OEM rotors often avoid this by leaving the disc face blank, but that compromises bite and brake feel. AP Racing’s patented J Hook design, developed through rigorous R&D, solves this problem. The hooks are meticulously spaced around the disc’s circumference and from hat to edge, forming a continuous distortion path that ensures even heat distribution. This encourages uniform pad deposits during bed-in, helps reduce judder and cracking, and improves consistency under repeated high-load braking. In addition, the J Hook slots provide more leading edges for pads to grip than traditional curved slots or blank rotors. While this might generate a mild whirring sound during braking, the benefits—more bite, cleaner bedding, better pedal feel—make it the top choice for committed racers and serious track day drivers. Metallurgy Backed by 50+ Years of Motorsport Leadership AP Racing's reputation is built on performance, and their proprietary iron alloy used in J Hook rotors is no exception. Drawing from over five decades of elite motorsport experience, including 750+ Formula 1 wins and widespread use across NASCAR, AP’s engineers have developed a disc alloy that excels under sustained racing temperatures and stress. Where OEM discs focus on affordability and mass production, AP Racing’s J Hook rotors are purpose-built for motorsport durability and heat resistance. Affordable Replacement Cost: Serious Value for Serious Drivers Even the best brake rotors are consumables. When you drive hard—especially at the track—your discs will eventually wear out. That’s why AP Racing designed their replacement iron rings to be cost-effective, allowing you to replace worn parts without breaking the bank. Compare that to constantly buying cheap $150 rotors every weekend—rotors that can't handle the heat and need to be swapped frequently. With AP Racing’s J Hook rotors, you get longer service intervals, less downtime, and better performance over time, making them an incredibly smart long-term investment. Proven on Track. Trusted by Champions. Top-tier racing teams rely on AP Racing J Hook rotors for one reason: they perform under pressure. Whether you're running time trials, attending HPDE events, or competing in wheel-to-wheel racing, these rotors offer professional-grade reliability, safety, and performance. Bedding and preparation of AP Racing J Hook Disc Properly preparing your new brake discs before heavy use is extremely important. The goal of bedding-in your brake pads and discs is to mate them together properly and prepare them for heavy use.  When prepared properly, or bed-in, your pads will transfer a thin layer of material to the disc face (transfer layer).  The pads in your caliper will then actually ride on that thin layer of pad material you’ve put down on the rotor, rather than rubbing directly on the iron rotor face.  A good transfer layer is going to give you superior brake pedal feel, less noise, superior pad wear, and lower the chances of cracking your discs. Important Notes- PLEASE READ! First, make sure you are on a closed course to perform a proper bed-in.  Do NOT perform the procedure on public roads.  You need a stretch of asphalt with long straights, good visibility, and no potential obstructions.  Make sure you are in a position to safely and repeatedly attain the necessary speeds to perform the bed-in procedure.  A controlled racetrack is the best place to perform this procedure.  AP Racing and Competition Motorsport in no way suggest or condone speeding on public roads or breaking the law in your car, nor do we take responsibility for any damage or injury that occurs as a result of using our product or these procedures.  You are performing the bed-in procedure at your own risk.  During these procedures, it’s critical that you never come to a complete stop with your foot on the brake pedal.  If you have brake ducts on your car, you may want to block them off to allow your brake system to heat up easily. The procedure outlined below is a generic procedure for most types of mild race pad.  Please check your pad manufacturer’s recommended bed-in procedure. Accelerate to approximately 60mph and then decelerate down to 5 mph.  If your car has ABS, you should try to hold the brakes at a point just before ABS intervention.  Once the car slows to 5mph, immediately accelerate back up to about 60mph, and brake again to roughly 5mph.  Repeat this series of stopping and accelerating 8 to 10 times.  Again, do not come to a complete stop with your foot on the brake pedal. Cool the brake system down by cruising at 45mph+ for 5 to 10 minutes. Visually inspect your discs.  They should be a blue/grey color (instead of shiny silver), and have an even layer of pad material across and around the entire rotor face. If the AP Racing rotors don’t have a layer of pad material on them, perform another series of stops in the manner outlined above.

Girodisc Porsche 350mm Rear Rotors Upgrade the braking performance of your Porsche 997 Turbo with Girodisc’s lightweight 350mm rear rotors. Designed for both PCCB and non-PCCB vehicles, these direct-fit rotors reduce unsprung mass, improve cooling efficiency, and provide consistent braking power on road or track. Vehicle Fitment Porsche 997 Turbo (All Models)Works with PCCB and non-PCCB brake systemsDirect OEM replacement – bolts to factory calipers and hardware Built for Precision and Performance The Girodisc system replaces the OEM rotor with a two-piece floating assembly that combines a CNC-machined 6061-T6 aluminum hat and a proprietary cast-iron friction ring, both produced in the USA. The curved vane internal design functions as a centrifugal pump, drawing air through the rotor to keep temperatures stable under heavy braking. This setup maintains factory brake bias and ABS calibration while delivering quicker cooling and improved pedal feel. Features • Direct OEM replacement – no modifications required• 6061-T6 billet aluminum hats, anodized for durability• Proprietary cast-iron friction rings cast and machined in the USA• Floating mount system with cadmium-plated steel drive pins• Anti-noise spring washers prevent rattle while allowing thermal expansion• Curved internal vane design improves cooling and fade resistance• Reduces unsprung and rotational mass• Maintains OEM brake bias and ABS function• Fully rebuildable – replace only friction rings when worn• Sold/priced per pair Girodisc A2-032 Rear Rotor FAQs: Will these work on both PCCB and steel-rotor cars? Yes. They’re engineered to fit either configuration of the 997 Turbo without modification, using your factory calipers and hardware. How do they compare to the factory PCCB rotors? Girodisc rotors offer improved heat tolerance and lower long-term costs, with performance closer to a motorsport-grade iron system while retaining OEM compatibility. What benefits will I notice on track? Expect better heat management, reduced fade, and more consistent pedal feel—even during repeated high-speed braking sessions. Are they serviceable? Absolutely. When the friction rings wear out, they can be replaced separately, making these rotors a long-term performance investment. Enhance your Porsche 997 Turbo’s braking confidence with Girodisc 350mm rear rotors—engineered for precision, performance, and endurance.

Girodisc Porsche 350mm Front Rotors The Girodisc 350mm Front Rotor system is a direct replacement for the factory Porsche rotors, offering a perfect bolt-on fit with no modifications required. Designed to reduce unsprung weight and rotational mass, these rotors enhance braking response, acceleration, and overall performance. Crafted from premium U.S.-sourced materials, this two-piece floating rotor system ensures exceptional strength, cooling, and consistency lap after lap. Lightweight Two-Piece Design for Precision Braking The central hat is machined from 6061-T6 aircraft-grade aluminum, anodized for corrosion resistance, and paired with Girodisc’s proprietary cast iron rings poured and finished entirely in the USA. The curved internal vane design acts as a centrifugal pump, drawing cool air through the rotor for superior temperature control during demanding track sessions or spirited driving. Girodisc A1-032 Features • Direct bolt-on replacement for OEM rotors — no modifications required• Two-piece floating design reduces rotational mass and improves response• 6061-T6 aircraft-spec aluminum hats for durability and corrosion protection• Proprietary cast iron rotor rings ensure consistent braking and fade resistance• Curved vane internal design for maximum airflow and cooling• Anti-noise spring washer system eliminates rattle while allowing rotor float• Fully rebuildable — only replace iron rings when worn Vehicle Fitment Designed specifically for Porsche models utilizing 350mm front rotors, including select 997, 991, and 981 variants equipped with OEM iron brake systems. Compatible with factory calipers and ABS systems. Girodisc A1-032 FAQs Do these rotors require any special installation? No — they are a direct fit and require no modification to the car or calipers. Can I reuse the aluminum hats when the rings wear out? Yes. Girodisc rotors are fully rebuildable; only the cast iron rings need replacing. How do these compare to the stock Porsche rotors? They’re lighter, stronger, and dissipate heat far more effectively — improving pedal feel and reducing fade. Are these rotors suitable for street use? Absolutely. They’re ideal for both aggressive street driving and regular track events. Upgrade your Porsche’s stopping performance with the Girodisc A1-032 350mm Front Rotors — precision-engineered for reduced weight, improved cooling, and unbeatable reliability.

D1-156 Girodisc Front Replacement Rotor Rings REPLACEMENT ROTOR RINGS AND INSTALLATION HARDWARE ONLY. DOES NOT INCLUDE ALUMINUM HATS. Competition Motorsport is an authorized dealer for Girodisc products and we are one of the largest stocking dealers in the country.We ship most products same or next business day to ensure we meet your delivery deadline. The Girodisc replacement rotor system is a direct rotor disc replacement for the Girodisc 2-piece hat and rotor and no modifications are necessary. The rotor and hat mount together through a floating mount system which utilizes 8-10 high strength alloy steel drive pins manufactured by Girodisc in the USA to their own specifications and are cadmium plated for corrosion resistance.The alloy drive pins transfer the load from braking while maintaining the axial and radial float between the disc rotor and hat.The pins are secured by grade 12 cap screws with hardened washers and mounted with anti-noise spring washers to allow for heat expansion while eliminating the rattle and noise associated with floating rotors. The 2-piece Girodisc design allows for rotor only replacement to minimize replacement costs and deliver outstanding performance and cooling. Sold/priced per pair.

D2-156 Girodisc Rear Replacement Rotor Rings REPLACEMENT ROTOR DISCS ONLY, DOES NOT INCLUDE ALUMINUM HAT. Competition Motorsport is an Authorized dealer for GiroDisc products and we are one of the largest stocking dealers in the country.  We ship most products same or next business day to ensure we meet your delivery deadline. The GiroDisc replacement rotor system is a direct rotor disc replacement for the Giro Disc 2-piece hat and rotor and no modifications are necessary.   The rotor and hat mount together through a floating mount system which utilizes 8-10 high strength alloy steel drive pins manufactured by GiroDisc in the USA to our own specifications and are cadmium plated for corrosion resistance.  The alloy drive pins transfer the load from the brake action while maintaining the axial and radial float between the disc rotor and hat.  The pins are secured by grade 12 cap screws with hardened washers and mounted with anti-noise spring washers to allow for heat expansion while eliminating the rattle and noise associated with floating rotors. The 2-piece GiroDisc design allows for rotor only replacement to minimize replacement costs and deliver outstanding performance and cooling. Sold/Priced per pair.

AP Racing J Hook 350x28mm Replacement Rear Brake Rotor Rings This kit is two replacement rotor discs and new installation hardware only. Center hats are not included. Replacement rotor rings for AP Racing 13.01.20014. Fits The Following Cars (w/ OEM iron rotors): Porsche 992 911 S/4S/GTS Porsche 991 911 S/4S/GTS Sold/priced per pair of rotor rings (including hardware). AP Racing J Hook Brake Rotors – The Gold Standard in Track Day & Racing Performance Engineered for professional motorsport, HPDE, and dedicated track day use, AP Racing’s J Hook Brake Rotors deliver uncompromising performance, thermal stability, and consistent braking power. These two-piece, floating rotors are built to handle the extreme demands of road racing, with design features derived from over 50 years of elite competition—including Formula 1, NASCAR, and IMSA. Unlike conventional one-piece rotors, AP Racing’s two-piece floating design features a billet aluminum hat mated to a cast iron disc via precision-engineered bobbins. This setup allows for controlled radial expansion under high heat, minimizing distortion and coning. The result? More even pad wear, a firmer pedal feel, and longer component life, even during extended lapping sessions or endurance racing. Floating hardware includes anti-knockback spring clips that reduce piston retraction while eliminating common NVH issues like rattling. Why Choose AP Racing J Hook Rotors? Advanced Cooling, Superior Bite, Unmatched Durability At the heart of every rotor is AP Racing’s proprietary high-carbon iron alloy, developed to withstand repeated thermal cycling without cracking or warping. Internally, directional vanes—far superior to OEM pillar or straight vane designs—maximize airflow and cooling. With 60 to 84 vanes per rotor, AP Racing achieves faster heat evacuation, reduced brake fade, and a more consistent friction surface. These rotors are left/right-specific for optimal airflow and balance. The exclusive J Hook slot pattern offers enhanced initial bite and promotes uniform heat distribution across the rotor face, reducing pad deposits and vibration. Unlike drilled rotors or straight-slot competitors, the J Hook design provides cleaner pad transfer during bed-in and superior modulation under braking—ideal for serious drivers who demand feedback and control. Yes, you might hear a little more whirr, but you’ll gain the stopping power, consistency, and longevity your lap times demand. Premium Components, Affordable Performance The rotor hats are CNC-machined from 6061-T6 billet aluminum and hard anodized for strength and heat resistance. Scalloped edges under the hat further assist heat dissipation. All hardware is U.S.-made to AP Racing spec, the same quality found on pro-level racing platforms. And while these rotors are race-proven, they’re also surprisingly cost-effective to replace. Don’t settle for cheap rotors that crack after a weekend—AP’s J Hook rings offer better durability and real long-term value. Fewer replacements mean more track time, less downtime, and peace of mind knowing you're running the best. Used by Champions. Trusted by Experts. From endurance racers to HPDE enthusiasts, AP Racing brake rotors are trusted worldwide for their reliability, longevity, and performance under pressure. Whether you're shaving seconds off your lap time or building a dedicated track car, the J Hook delivers a professional-grade solution that won’t let you down. AP Racing J Hook Brake Rotors for Auto Racing, Track Days & HPDE Why Rotor Design Matters: Heat Expansion and Floating Technology As with most metals, iron brake discs expand significantly under heat. When temperatures rise, the disc grows radially—expanding in both diameter and circumference. Traditional one-piece rotors struggle to accommodate this natural expansion. As the outer edge pulls away from the center under heat stress, it creates a condition called “coning”—a distortion that compromises pad-to-rotor contact. This distortion can lead to uneven pad wear, brake tapering, and an inconsistent, long brake pedal. AP Racing two-piece floating brake rotors are purpose-built to eliminate these issues. Engineered with “float” built into the disc or hat assembly, these rotors feature oblong-shaped mounting holes that allow the hardware to slide as the disc heats up. This flexibility ensures the disc runs true within the caliper under high-temperature loads, effectively reducing distortion, minimizing pad taper and stress cracks, and promoting longer component life. Custom Mounting Hardware & Anti-Knockback Spring Clips AP Racing rotors utilize application-specific, U.S.-made mounting hardware—not generic bolts. These premium components are the exact parts used in AP’s professional motorsport products, engineered to withstand the rigors of competitive racing. To manage lateral disc motion that can push caliper pistons backward (known as knockback), AP Racing integrates anti-knockback spring clips on alternating bobbins—five on a ten-bolt setup, six on a twelve-bolt disc. These clips keep the aluminum hat and iron disc ring properly aligned while still allowing for radial float. Bonus: they eliminate annoying rattles and vibrations, ensuring a quieter, more refined braking experience. High-Performance Hat Design for Heat Isolation The disc hats in AP Racing’s two-piece floating rotors are CNC-machined from 6061-T6 billet aluminum and finished with a hard anodized coating. This high-strength aluminum alloy was selected for its ability to maintain structural integrity even at elevated temperatures. AP adds scalloped channels beneath the hat to further encourage airflow and heat evacuation from the outer disc face, minimizing thermal transfer to hubs and wheel bearings—helping reduce maintenance costs on these expensive components. Internal Vane Engineering: Airflow Optimization & Thermal Stability AP Racing’s internal vane design sets them apart from OEM and most aftermarket competitors. While many factory brake discs use non-directional pillar vanes (low-cost and NVH-focused), AP Racing rotors use directional vanes engineered for maximum airflow. These rotors are side-specific—meaning you’ll receive a unique left and right disc in each set—ensuring optimized cooling through strategic vane orientation and shape. Beyond that, AP Racing rotors feature a superior vane count, typically ranging from 60 to 84 vanes, compared to 30–48 in most aftermarket rotors. After extensive CFD and thermal analysis, this high vane count was proven to: Increase airspeed and thermal transfer Reduce recirculation and deflection at the disc face Minimize coning, cracking, and brake fade Deliver more even pad contact and extended rotor life J Hook Slot Pattern: Exclusive to AP Racing Slots and drill holes may improve initial bite, but they also introduce “cool spots” in the rotor face—areas of uneven heating that can lead to stress risers, cracks, and pad vibration. OEM rotors often avoid this by leaving the disc face blank, but that compromises bite and brake feel. AP Racing’s patented J Hook design, developed through rigorous R&D, solves this problem. The hooks are meticulously spaced around the disc’s circumference and from hat to edge, forming a continuous distortion path that ensures even heat distribution. This encourages uniform pad deposits during bed-in, helps reduce judder and cracking, and improves consistency under repeated high-load braking. In addition, the J Hook slots provide more leading edges for pads to grip than traditional curved slots or blank rotors. While this might generate a mild whirring sound during braking, the benefits—more bite, cleaner bedding, better pedal feel—make it the top choice for committed racers and serious track day drivers. Metallurgy Backed by 50+ Years of Motorsport Leadership AP Racing's reputation is built on performance, and their proprietary iron alloy used in J Hook rotors is no exception. Drawing from over five decades of elite motorsport experience, including 750+ Formula 1 wins and widespread use across NASCAR, AP’s engineers have developed a disc alloy that excels under sustained racing temperatures and stress. Where OEM discs focus on affordability and mass production, AP Racing’s J Hook rotors are purpose-built for motorsport durability and heat resistance. Affordable Replacement Cost: Serious Value for Serious Drivers Even the best brake rotors are consumables. When you drive hard—especially at the track—your discs will eventually wear out. That’s why AP Racing designed their replacement iron rings to be cost-effective, allowing you to replace worn parts without breaking the bank. Compare that to constantly buying cheap $150 rotors every weekend—rotors that can't handle the heat and need to be swapped frequently. With AP Racing’s J Hook rotors, you get longer service intervals, less downtime, and better performance over time, making them an incredibly smart long-term investment. Proven on Track. Trusted by Champions. Top-tier racing teams rely on AP Racing J Hook rotors for one reason: they perform under pressure. Whether you're running time trials, attending HPDE events, or competing in wheel-to-wheel racing, these rotors offer professional-grade reliability, safety, and performance. Bedding and Preparation of AP Racing J Hook Discs Properly preparing your new brake discs before heavy use is extremely important. The goal of bedding-in your brake pads and discs is to mate them together properly and prepare them for heavy use.  When prepared properly, or bed-in, your pads will transfer a thin layer of material to the disc face (transfer layer).  The pads in your caliper will then actually ride on that thin layer of pad material you’ve put down on the rotor, rather than rubbing directly on the iron rotor face.  A good transfer layer is going to give you superior brake pedal feel, less noise, superior pad wear, and lower the chances of cracking your discs. Important Notes- PLEASE READ! First, make sure you are on a closed course to perform a proper bed-in.  Do NOT perform the procedure on public roads.  You need a stretch of asphalt with long straights, good visibility, and no potential obstructions.  Make sure you are in a position to safely and repeatedly attain the necessary speeds to perform the bed-in procedure.  A controlled racetrack is the best place to perform this procedure.  AP Racing and Competition Motorsport in no way suggest or condone speeding on public roads or breaking the law in your car, nor do we take responsibility for any damage or injury that occurs as a result of using our product or these procedures.  You are performing the bed-in procedure at your own risk.  During these procedures, it’s critical that you never come to a complete stop with your foot on the brake pedal.  If you have brake ducts on your car, you may want to block them off to allow your brake system to heat up easily. The procedure outlined below is a generic procedure for most types of mild race pad.  Please check your pad manufacturer’s recommended bed-in procedure. Accelerate to approximately 60mph and then decelerate down to 5 mph.  If your car has ABS, you should try to hold the brakes at a point just before ABS intervention.  Once the car slows to 5mph, immediately accelerate back up to about 60mph, and brake again to roughly 5mph.  Repeat this series of stopping and accelerating 8 to 10 times.  Again, do not come to a complete stop with your foot on the brake pedal. Cool the brake system down by cruising at 45mph+ for 5 to 10 minutes. Visually inspect your discs.  They should be a blue/grey color (instead of shiny silver), and have an even layer of pad material across and around the entire rotor face. If the AP Racing rotors don’t have a layer of pad material on them, perform another series of stops in the manner outlined above.

AP Racing J Hook 350x34mm Replacement Front Brake Rotor Rings This kit is two replacement rotor discs and new installation hardware only. Center hats are not included. Replacement rotor rings for AP Racing 13.01.20012. Fits The Following Cars (w/ OEM iron rotors): Porsche 992 911 S/4S/GTS Porsche 991 911 S/4S/GTS Sold/priced per pair of rotor rings (including hardware). AP Racing J Hook Brake Rotors – The Gold Standard in Track Day & Racing Performance Engineered for professional motorsport, HPDE, and dedicated track day use, AP Racing’s J Hook Brake Rotors deliver uncompromising performance, thermal stability, and consistent braking power. These two-piece, floating rotors are built to handle the extreme demands of road racing, with design features derived from over 50 years of elite competition—including Formula 1, NASCAR, and IMSA. Unlike conventional one-piece rotors, AP Racing’s two-piece floating design features a billet aluminum hat mated to a cast iron disc via precision-engineered bobbins. This setup allows for controlled radial expansion under high heat, minimizing distortion and coning. The result? More even pad wear, a firmer pedal feel, and longer component life, even during extended lapping sessions or endurance racing. Floating hardware includes anti-knockback spring clips that reduce piston retraction while eliminating common NVH issues like rattling. Why Choose AP Racing J Hook Rotors? Advanced Cooling, Superior Bite, Unmatched Durability At the heart of every rotor is AP Racing’s proprietary high-carbon iron alloy, developed to withstand repeated thermal cycling without cracking or warping. Internally, directional vanes—far superior to OEM pillar or straight vane designs—maximize airflow and cooling. With 60 to 84 vanes per rotor, AP Racing achieves faster heat evacuation, reduced brake fade, and a more consistent friction surface. These rotors are left/right-specific for optimal airflow and balance. The exclusive J Hook slot pattern offers enhanced initial bite and promotes uniform heat distribution across the rotor face, reducing pad deposits and vibration. Unlike drilled rotors or straight-slot competitors, the J Hook design provides cleaner pad transfer during bed-in and superior modulation under braking—ideal for serious drivers who demand feedback and control. Yes, you might hear a little more whirr, but you’ll gain the stopping power, consistency, and longevity your lap times demand. Premium Components, Affordable Performance The rotor hats are CNC-machined from 6061-T6 billet aluminum and hard anodized for strength and heat resistance. Scalloped edges under the hat further assist heat dissipation. All hardware is U.S.-made to AP Racing spec, the same quality found on pro-level racing platforms. And while these rotors are race-proven, they’re also surprisingly cost-effective to replace. Don’t settle for cheap rotors that crack after a weekend—AP’s J Hook rings offer better durability and real long-term value. Fewer replacements mean more track time, less downtime, and peace of mind knowing you're running the best. Used by Champions. Trusted by Experts. From endurance racers to HPDE enthusiasts, AP Racing brake rotors are trusted worldwide for their reliability, longevity, and performance under pressure. Whether you're shaving seconds off your lap time or building a dedicated track car, the J Hook delivers a professional-grade solution that won’t let you down. AP Racing J Hook Brake Rotors for Auto Racing, Track Days & HPDE Why Rotor Design Matters: Heat Expansion and Floating Technology As with most metals, iron brake discs expand significantly under heat. When temperatures rise, the disc grows radially—expanding in both diameter and circumference. Traditional one-piece rotors struggle to accommodate this natural expansion. As the outer edge pulls away from the center under heat stress, it creates a condition called “coning”—a distortion that compromises pad-to-rotor contact. This distortion can lead to uneven pad wear, brake tapering, and an inconsistent, long brake pedal. AP Racing two-piece floating brake rotors are purpose-built to eliminate these issues. Engineered with “float” built into the disc or hat assembly, these rotors feature oblong-shaped mounting holes that allow the hardware to slide as the disc heats up. This flexibility ensures the disc runs true within the caliper under high-temperature loads, effectively reducing distortion, minimizing pad taper and stress cracks, and promoting longer component life. Custom Mounting Hardware & Anti-Knockback Spring Clips AP Racing rotors utilize application-specific, U.S.-made mounting hardware—not generic bolts. These premium components are the exact parts used in AP’s professional motorsport products, engineered to withstand the rigors of competitive racing. To manage lateral disc motion that can push caliper pistons backward (known as knockback), AP Racing integrates anti-knockback spring clips on alternating bobbins—five on a ten-bolt setup, six on a twelve-bolt disc. These clips keep the aluminum hat and iron disc ring properly aligned while still allowing for radial float. Bonus: they eliminate annoying rattles and vibrations, ensuring a quieter, more refined braking experience. High-Performance Hat Design for Heat Isolation The disc hats in AP Racing’s two-piece floating rotors are CNC-machined from 6061-T6 billet aluminum and finished with a hard anodized coating. This high-strength aluminum alloy was selected for its ability to maintain structural integrity even at elevated temperatures. AP adds scalloped channels beneath the hat to further encourage airflow and heat evacuation from the outer disc face, minimizing thermal transfer to hubs and wheel bearings—helping reduce maintenance costs on these expensive components. Internal Vane Engineering: Airflow Optimization & Thermal Stability AP Racing’s internal vane design sets them apart from OEM and most aftermarket competitors. While many factory brake discs use non-directional pillar vanes (low-cost and NVH-focused), AP Racing rotors use directional vanes engineered for maximum airflow. These rotors are side-specific—meaning you’ll receive a unique left and right disc in each set—ensuring optimized cooling through strategic vane orientation and shape. Beyond that, AP Racing rotors feature a superior vane count, typically ranging from 60 to 84 vanes, compared to 30–48 in most aftermarket rotors. After extensive CFD and thermal analysis, this high vane count was proven to: Increase airspeed and thermal transfer Reduce recirculation and deflection at the disc face Minimize coning, cracking, and brake fade Deliver more even pad contact and extended rotor life J Hook Slot Pattern: Exclusive to AP Racing Slots and drill holes may improve initial bite, but they also introduce “cool spots” in the rotor face—areas of uneven heating that can lead to stress risers, cracks, and pad vibration. OEM rotors often avoid this by leaving the disc face blank, but that compromises bite and brake feel. AP Racing’s patented J Hook design, developed through rigorous R&D, solves this problem. The hooks are meticulously spaced around the disc’s circumference and from hat to edge, forming a continuous distortion path that ensures even heat distribution. This encourages uniform pad deposits during bed-in, helps reduce judder and cracking, and improves consistency under repeated high-load braking. In addition, the J Hook slots provide more leading edges for pads to grip than traditional curved slots or blank rotors. While this might generate a mild whirring sound during braking, the benefits—more bite, cleaner bedding, better pedal feel—make it the top choice for committed racers and serious track day drivers. Metallurgy Backed by 50+ Years of Motorsport Leadership AP Racing's reputation is built on performance, and their proprietary iron alloy used in J Hook rotors is no exception. Drawing from over five decades of elite motorsport experience, including 750+ Formula 1 wins and widespread use across NASCAR, AP’s engineers have developed a disc alloy that excels under sustained racing temperatures and stress. Where OEM discs focus on affordability and mass production, AP Racing’s J Hook rotors are purpose-built for motorsport durability and heat resistance. Affordable Replacement Cost: Serious Value for Serious Drivers Even the best brake rotors are consumables. When you drive hard—especially at the track—your discs will eventually wear out. That’s why AP Racing designed their replacement iron rings to be cost-effective, allowing you to replace worn parts without breaking the bank. Compare that to constantly buying cheap $150 rotors every weekend—rotors that can't handle the heat and need to be swapped frequently. With AP Racing’s J Hook rotors, you get longer service intervals, less downtime, and better performance over time, making them an incredibly smart long-term investment. Proven on Track. Trusted by Champions. Top-tier racing teams rely on AP Racing J Hook rotors for one reason: they perform under pressure. Whether you're running time trials, attending HPDE events, or competing in wheel-to-wheel racing, these rotors offer professional-grade reliability, safety, and performance. Bedding and Preparation of AP Racing J Hook Discs Properly preparing your new brake discs before heavy use is extremely important. The goal of bedding-in your brake pads and discs is to mate them together properly and prepare them for heavy use.  When prepared properly, or bed-in, your pads will transfer a thin layer of material to the disc face (transfer layer).  The pads in your caliper will then actually ride on that thin layer of pad material you’ve put down on the rotor, rather than rubbing directly on the iron rotor face.  A good transfer layer is going to give you superior brake pedal feel, less noise, superior pad wear, and lower the chances of cracking your discs. Important Notes- PLEASE READ! First, make sure you are on a closed course to perform a proper bed-in.  Do NOT perform the procedure on public roads.  You need a stretch of asphalt with long straights, good visibility, and no potential obstructions.  Make sure you are in a position to safely and repeatedly attain the necessary speeds to perform the bed-in procedure.  A controlled racetrack is the best place to perform this procedure.  AP Racing and Competition Motorsport in no way suggest or condone speeding on public roads or breaking the law in your car, nor do we take responsibility for any damage or injury that occurs as a result of using our product or these procedures.  You are performing the bed-in procedure at your own risk.  During these procedures, it’s critical that you never come to a complete stop with your foot on the brake pedal.  If you have brake ducts on your car, you may want to block them off to allow your brake system to heat up easily. The procedure outlined below is a generic procedure for most types of mild race pad.  Please check your pad manufacturer’s recommended bed-in procedure. Accelerate to approximately 60mph and then decelerate down to 5 mph.  If your car has ABS, you should try to hold the brakes at a point just before ABS intervention.  Once the car slows to 5mph, immediately accelerate back up to about 60mph, and brake again to roughly 5mph.  Repeat this series of stopping and accelerating 8 to 10 times.  Again, do not come to a complete stop with your foot on the brake pedal. Cool the brake system down by cruising at 45mph+ for 5 to 10 minutes. Visually inspect your discs.  They should be a blue/grey color (instead of shiny silver), and have an even layer of pad material across and around the entire rotor face. If the AP Racing rotors don’t have a layer of pad material on them, perform another series of stops in the manner outlined above.

D1-032 Girodisc Porsche 350mm Front Replacement Rings Maintain your Porsche’s sharp, confidence-inspiring braking feel with Girodisc D1-032 350 mm front replacement rings. These precision-machined rotors are direct replacements for Girodisc two-piece systems and mount to your existing aluminum hats using the included floating hardware kit. Each ring is crafted from Girodisc’s proprietary high-carbon cast-iron alloy, delivering outstanding heat control, fade resistance, and smooth pedal feedback under repeated high-load braking. Vehicle Fitment Compatible with:• Porsche 996 Carrera 4S (2002 – 2005)• Porsche 997 Carrera S / 4S (2005 – 2012)• Porsche 997 GTS (2010 – 2012)Note: Designed exclusively for Girodisc 350 mm two-piece front rotor systems. Not compatible with OEM one-piece or carbon-ceramic rotors. Features • Sold as a left/right pair with complete floating hardware kit• Direct replacements for Girodisc 350 mm two-piece front rotors• High-carbon iron construction for stable friction and thermal control• Directional curved vanes maximize cooling efficiency• Maintains OEM brake bias and ABS calibration• Precision-balanced for vibration-free performance• Designed exclusively for Girodisc aluminum hats Specifications • Diameter: 350 mm• Position: Front• Material: High-carbon cast iron• Mount type: Floating two-piece system• Includes: Two rotor rings and hardware kit• Sold/priced per pair Girodisc D1-032 Porsche 350 mm Front Replacement Ring FAQs Will these fit OEM Porsche rotor hats? No. These rings are engineered specifically for Girodisc aluminum hats and cannot be used with factory one-piece rotors. What pad compounds work best with these rotors? For street and spirited use, Ferodo DS2500 or Hawk HPS 5.0 are ideal. For track days, Pagid RS29 or Carbotech XP12 deliver exceptional fade control and braking stability. Are these rotors directional? Yes. Each rotor is clearly marked left and right to ensure the internal curved vanes flow air through the rotor for optimal cooling. How should the hardware be torqued? Tighten each bolt to 12 ft-lbs (16 Nm) using blue Loctite. Recheck torque after one full heat cycle to confirm proper float and hardware security. Upgrade your Porsche’s braking system with Girodisc D1-032 350 mm front replacement rings — precision-built for heat management, durability, and track-ready stopping power.