GiroDisc Porsche Caliper Stud Kit 3 – BCS-03

The GiroDisc Porsche Caliper Stud Kit 3 (BCS-03) is a performance brake caliper mounting upgrade designed for select Porsche 911, Cayman, Boxster, and 718 models. Engineered for track-day enthusiasts, club racers, and Porsche owners who frequently service their brakes, this kit replaces conventional brake caliper mounting bolts with high-strength stainless steel studs and reusable nuts.

Repeated brake caliper removal can increase wear on the threaded mounting points in Porsche's expensive suspension uprights. The GiroDisc caliper stud conversion helps protect these threads while making brake caliper installation, removal, rotor changes, and routine brake maintenance more convenient.

Manufactured using 17-4 PH stainless steel studs and premium ARP 12-point nuts, the BCS-03 delivers a durable, corrosion-resistant mounting solution for compatible Porsche braking systems.

Protect Your Porsche Caliper Mounting Threads

Brake maintenance is a regular part of performance driving, especially for Porsche owners participating in HPDE events, endurance racing, and competitive track use.

Every time a factory brake caliper bolt is removed and reinstalled, the mounting threads in the upright are subjected to additional wear. Over time, repeated service can damage these threads and lead to expensive repairs.

The GiroDisc BCS-03 stud conversion addresses this problem by allowing the studs to remain installed in the upright while the caliper is secured with removable nuts.

This configuration reduces repeated engagement of the upright threads during brake service and provides a more convenient way to position the caliper during installation.

High-Strength Stainless Steel Construction

GiroDisc manufactures its brake caliper studs from aerospace-quality 17-4 PH stainless steel, selected for its high strength and corrosion resistance.

The kit also features premium ARP stainless steel 12-point nuts, engineered to provide reliable clamping performance in demanding motorsport environments.

The compact 12-point nut design is particularly useful in the limited space surrounding Porsche brake caliper mounting locations.

GiroDisc BCS-03 Features

• High-strength 17-4 PH stainless steel caliper mounting studs
• Premium ARP stainless steel 12-point nuts
• Designed to reduce wear on Porsche upright mounting threads
• Allows easier brake caliper removal and reinstallation
• Helps guide calipers into position during installation
• Corrosion-resistant stainless steel construction
• Designed for frequent brake maintenance and track use
• Compatible with specified Porsche factory steel brake and GiroDisc upgrade configurations
• Complete mounting hardware for one axle
• Suitable for professional motorsport and performance driving applications

GiroDisc Porsche Caliper Stud Kit 3 Specifications

• Manufacturer: GiroDisc
• Product Name: Porsche Caliper Stud Kit 3
• Manufacturer Part Number: BCS-03
• Product Type: Brake Caliper Mounting Stud Conversion Kit
• Stud Material: 17-4 PH Stainless Steel
• Fastener Type: ARP 12-Point Stainless Steel Nuts
• Application: Select Porsche Brake Caliper Mounting Configurations
• Installation Location: Front or Rear, Depending on Vehicle and Brake Configuration
• Quantity Required: One Kit Per Axle
• Front and Rear Conversion: Two Kits When BCS-03 Is Specified for Both Axles
• Manufacturer SKU: BCS-03

What's Included With GiroDisc BCS-03

• Four stainless steel brake caliper mounting studs
• Four ARP 12-point mounting nuts
• Four matching washers
• Medium-strength thread-locking compound

Important: One GiroDisc caliper stud kit provides mounting hardware for two brake calipers on one axle. Two kits are necessary to convert both front and rear axles when BCS-03 is specified for both positions.

GiroDisc BCS-03 Porsche Vehicle Fitment

The GiroDisc BCS-03 fits select Porsche models depending on the specific brake configuration, caliper location, and whether GiroDisc rotor upgrades require additional caliper spacing.

Fitment must be confirmed using the vehicle's brake equipment and the correct GiroDisc application chart before installation.

Porsche 911 Applications

• Porsche 911 Carrera / Carrera 4 (997.2): Front and rear with applicable GiroDisc caliper spacer configurations
• Porsche 911 Carrera / Carrera 4 (991.1): Front and rear with applicable GiroDisc caliper spacer configurations
• Porsche 911 Carrera S / 4S / GTS (991.1): Rear with applicable GiroDisc caliper spacer configurations
• Porsche 911 Carrera / Carrera 4 (991.2): Front and rear with applicable GiroDisc caliper spacer configurations
• Porsche 911 Carrera T (991.2): Front and rear in specified brake configurations
• Porsche 911 Carrera S / 4S / GTS (991.2): Rear with applicable GiroDisc caliper spacer configurations
• Porsche 911 Carrera / Carrera 4 / Carrera T (992.1): Selected front and rear brake configurations
• Porsche 911 GT2 (996): Rear with applicable GiroDisc caliper spacer configuration
• Porsche 911 GT3 (996.2): Rear with applicable GiroDisc caliper spacer configuration

Porsche Cayman and Boxster Applications

• Porsche Cayman S / GTS (981): Front with applicable GiroDisc caliper spacer configuration
• Porsche Boxster S / GTS (981): Front with applicable GiroDisc caliper spacer configuration
• Porsche Boxster Spyder (981): Rear with applicable GiroDisc caliper spacer configuration
• Porsche 718 Cayman / Boxster (982): Front with applicable GiroDisc caliper spacer configuration
• Porsche 718 Cayman S / GTS (982): Front with applicable GiroDisc caliper spacer configuration
• Porsche 718 Boxster S / GTS (982): Front with applicable GiroDisc caliper spacer configuration

Fitment Notice: These applications are a general reference and do not mean BCS-03 is the correct stud kit for every original-equipment brake configuration. Different stud kit numbers may be required for factory mounting positions, PCCB-equipped vehicles, or other rotor and caliper arrangements.

Ideal for GiroDisc Two-Piece Rotor Upgrades

The GiroDisc BCS-03 is especially useful for Porsche owners installing compatible GiroDisc two-piece brake rotor upgrades that require caliper relocation hardware.

Some GiroDisc rotor upgrades increase rotor diameter and use caliper spacers to position the existing factory caliper correctly around the larger rotor.

When these spacers are installed, the required caliper fastener length can change. GiroDisc offers multiple stud kit configurations to accommodate the differences between original-equipment caliper positions and upgraded brake arrangements.

For this reason, the BCS-03 should only be selected when specified by the applicable GiroDisc brake conversion or caliper mounting application guide.

Designed for Track-Day and Racing Maintenance

Performance Porsche owners frequently remove brake calipers to inspect brake pads, service rotors, replace components, or perform more extensive brake maintenance.

Converting to a stud-based mounting system offers several practical benefits:

• Reduces repeated wear on suspension upright threads
• Makes it easier to position the brake caliper during installation
• Supports frequent brake service and rotor replacement
• Provides high-strength stainless steel mounting hardware
• Helps simplify maintenance on compatible Porsche brake systems

Installation and Safety Information

The GiroDisc BCS-03 is a safety-critical brake mounting component and should be installed by a qualified technician familiar with Porsche braking systems.

Before installation, confirm the correct stud length, thread engagement, caliper position, spacer configuration, and compatibility with the vehicle's brake system.

Follow GiroDisc's current installation instructions for thread preparation, thread-locking compound application, fastener torque, and inspection procedures.

Do not substitute factory bolt torque specifications for stud-and-nut installation specifications without confirmation from GiroDisc.

GiroDisc Porsche Caliper Stud Kit 3 FAQs

What does the GiroDisc BCS-03 caliper stud kit do?

The GiroDisc BCS-03 replaces conventional brake caliper mounting bolts with high-strength studs and nuts. This helps protect the threads in the suspension upright and simplifies brake caliper removal and installation.

How many calipers does one GiroDisc BCS-03 kit fit?

One kit includes enough mounting hardware for two brake calipers on one axle. If the BCS-03 is required on both the front and rear axles, two kits must be purchased.

Are GiroDisc BCS-03 studs made from stainless steel?

Yes. The mounting studs are manufactured from high-strength 17-4 PH stainless steel for durability and corrosion resistance.

Does the GiroDisc BCS-03 include ARP nuts?

Yes. The kit includes premium ARP stainless steel 12-point mounting nuts designed for high-strength brake caliper fastening.

Will BCS-03 fit my Porsche 911 Carrera?

The BCS-03 is compatible with several Porsche 911 Carrera generations, including select 997.2, 991.1, 991.2, and 992 applications. Correct fitment depends on whether the vehicle retains factory brake mounting geometry or uses a GiroDisc rotor upgrade with caliper spacers.

Can I use the BCS-03 with factory Porsche brake rotors?

Not necessarily. Many Porsche applications use a different GiroDisc stud kit with the factory brake configuration. BCS-03 is specified for certain upgraded or relocated caliper arrangements, so verify fitment before purchasing.

Will BCS-03 work with Porsche ceramic brakes?

Do not assume compatibility with Porsche Ceramic Composite Brakes (PCCB). Ceramic brake configurations can require different mounting hardware. Always verify the correct application using GiroDisc's current fitment information.

Does the BCS-03 work with GiroDisc two-piece rotors?

Yes, in specified applications. Certain GiroDisc rotor upgrades require caliper spacers, and BCS-03 is one of the stud kit options used with compatible configurations.

Why convert Porsche brake calipers from bolts to studs?

Stud conversions help minimize repeated wear on the threaded mounting points in Porsche suspension uprights while providing convenient caliper positioning and removal during regular brake maintenance.

Is professional installation recommended?

Yes. Brake caliper mounting hardware is a safety-critical component. Professional installation and verification of stud engagement, caliper spacing, torque, and brake system compatibility are strongly recommended.

Upgrade Your Porsche Brake Maintenance With GiroDisc

The GiroDisc Porsche Caliper Stud Kit 3 BCS-03 is a practical upgrade for performance Porsche owners who regularly service their brakes or use compatible GiroDisc rotor conversion systems.

With aerospace-quality stainless steel studs, ARP 12-point nuts, and a design focused on protecting expensive suspension upright threads, this kit provides a convenient, high-strength solution for demanding Porsche braking applications.