GiroDisc Porsche Caliper Stud Kit 4 – BCS-04

The GiroDisc Porsche Caliper Stud Kit 4 (BCS-04) converts compatible Porsche brake caliper mounting points from conventional bolts to stainless steel studs and removable nuts. It is designed for owners who service their brakes regularly, including track-day drivers and club racers.

This kit is selected by the vehicle's brake equipment, axle and caliper mounting arrangement. These are spacer applications. Factory-position hardware for these configurations is generally BCS-06.

Protect Your Porsche Caliper Mounting Threads

Repeated caliper removal means repeatedly threading a mounting bolt into the suspension upright. A stud conversion allows the stud to remain in place while the caliper is removed using the mounting nuts. This helps reduce repeated wear at the upright threads and makes it easier to guide the caliper back into position.

The BCS-04 is useful during rotor replacement, brake inspections and other service requiring caliper removal. Its benefits are especially practical for Porsche owners who perform frequent brake maintenance throughout a track season.

GiroDisc BCS-04 Features

• 17-4 PH stainless steel caliper mounting studs
• ARP stainless steel 12-point nuts
• Corrosion-resistant mounting hardware
• Studs remain installed during routine caliper removal
• Helps guide the caliper into position during installation
• Reduces repeated threading into the suspension upright
• Mounting hardware for two calipers on one axle
• Application: Specified GiroDisc caliper spacer configurations

GiroDisc Porsche Caliper Stud Kit 4 Specifications

• Manufacturer: GiroDisc
• Manufacturer Part Number: BCS-04
• Product Type: Brake Caliper Mounting Stud Conversion Kit
• Stud Material: 17-4 PH Stainless Steel
• Nut Type: ARP Stainless Steel 12-Point
• Installation Location: Front or rear, depending on application
• Mounting Configuration: Specified GiroDisc caliper spacer configurations
• Coverage: One Axle Per Kit

What's Included With GiroDisc BCS-04

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

One kit provides hardware for two calipers. Converting both axles requires two kits, and the front and rear may require different part numbers.

GiroDisc BCS-04 Porsche Vehicle Fitment

• Front and rear with specified GiroDisc spacers: 996 Carrera/Carrera 4, 997.1 Carrera/Carrera 4, 986 Boxster S, 987 S and Cayman R.
• Rear with specified GiroDisc spacers: 981 base/S and 718 base/S.

Fitment depends on the exact brake configuration, axle and spacer arrangement. The applications above are a selection guide. Confirm the part number against the current GiroDisc application information for the vehicle and rotor setup before purchase.

Factory Mounting Positions and GiroDisc Spacer Upgrades

Some Porsche GiroDisc rotor upgrades use caliper spacers to accommodate a larger rotor. A change in caliper position can change the required mounting hardware. A stud kit listed for a factory mounting position should not automatically be carried over to a spacer conversion.

The BCS-04 is intended for specified girodisc caliper spacer configurations. Check the front and rear requirements individually, including whether the car has factory iron brakes or Porsche Ceramic Composite Brakes (PCCB).

Installation Information

Follow GiroDisc's instructions for thread preparation, thread-locking compound, stud engagement and nut torque. Confirm the required caliper spacing and hardware before installation. A technician familiar with the vehicle's braking system should perform the work.

GiroDisc Porsche Caliper Stud Kit 4 FAQs

What does the GiroDisc BCS-04 caliper stud kit do?

It replaces the conventional caliper mounting bolts in compatible applications with studs and removable nuts, helping protect the upright threads during repeated brake service.

How many calipers does one BCS-04 kit cover?

One kit contains mounting hardware for two calipers on one axle. Check which kit is specified for each axle before ordering a complete front and rear conversion.

Where is BCS-04 installed?

Its installation location is front or rear, depending on application. Use the vehicle fitment section above to identify the relevant brake configuration.

Are the BCS-04 studs stainless steel?

Yes. The studs use 17-4 PH stainless steel, and the kit includes ARP stainless steel 12-point nuts.

Can I choose BCS-04 using only my Porsche model name?

No. Vehicle generation, brake equipment, axle and any caliper spacers must also match. Kits with different numbers should not be treated as interchangeable.

Will BCS-04 work with a GiroDisc rotor upgrade?

Only when this part number is specified for that rotor and caliper arrangement. Check whether the upgrade retains the factory mounting position or requires spacers.

Can the same stud kit be used on the front and rear?

Some applications specify the same kit on both axles, while others require different kits. Confirm the front and rear part numbers separately.

Does the kit replace the brake rotors or calipers?

No. This is a caliper mounting hardware conversion. Rotors, calipers and any required relocation spacers are separate components.