VW Golf GTI / R MK7 BTCC Big Brake Kit – AP Racing CP9660 Nickel Finish Complete Kit | XC3 Engineering

XC3 Engineering BTCC Big Brake Kit with Nickel AP Racing Calipers – VW Golf GTI / R MK7

Unlock serious braking performance with the XC3 Engineering BTCC Big Brake Kit for the VW Golf GTI and Golf R MK7, supplied with nickel-finish AP Racing CP9660 6-piston Pro 5000 Series R calipers.

Built around genuine ex-BTCC 368mm x 36mm brake rotors, custom XC3 Engineering CNC-machined bells and carriers, braided brake lines and competition brake pads, this complete front brake conversion is designed for demanding fast-road, track-day and motorsport use.

The nickel AP Racing calipers give this version a distinctive motorsport-inspired finish while retaining the same high-performance CP9660 architecture and braking capability.

Why Upgrade Your Golf MK7 Brakes?

As engine power, tyre grip and track use increase, the factory braking system can become one of the limiting factors on a modified Golf GTI or Golf R.

Repeated heavy braking generates substantial heat and can reduce consistency when the standard system is pushed beyond its intended operating range.

The XC3 BTCC Big Brake Kit substantially increases braking capability through:

• AP Racing CP9660 6-piston calipers
• Nickel-finish caliper bodies
• 368mm x 36mm ex-BTCC motorsport rotors
• High-performance race brake pads
• Braided brake lines
• Floating AP Racing rotor hardware

For track-focused and higher-powered Golf builds, this creates a significantly more capable foundation for repeated high-load braking.

AP Racing CP9660 Nickel 6-Piston Calipers

At the heart of the kit are AP Racing CP9660 Pro 5000 Series R 6-piston calipers finished in nickel.

The CP9660 is a motorsport-focused caliper designed for applications where stiffness, low weight, consistent pad pressure and reliable braking performance are critical.

Its 6-piston design distributes clamping force across a large motorsport brake pad, helping provide strong braking performance and consistent pedal response during repeated hard use.

The nickel finish also gives the calipers a distinctive competition-inspired appearance that sets this version apart from the standard caliper option.

Genuine Ex-BTCC 368mm x 36mm Rotors

The kit uses genuine ex-BTCC 368mm x 36mm brake rotors.

These rotor dimensions are not normally available for public retail purchase through AP Racing, as they are supplied specifically for British Touring Car Championship applications.

The rotors included with this kit have previously been used during a single BTCC event session before being removed.

Each rotor is inspected prior to supply to confirm that it remains in suitable working condition.

Using lightly used BTCC components makes it possible to offer genuine competition-specification braking hardware at a considerably more accessible price than an equivalent all-new motorsport setup.

XC3 Engineering CNC-Machined Rotor Bells

The BTCC rotors are paired with XC3 Engineering custom anodised rotor bells.

These components are CNC machined specifically to integrate the motorsport rotor with the Volkswagen Golf MK7 hub and braking system.

The anodised finish provides a high-quality appearance while adding surface protection.

Together with the AP Racing bobbin hardware, the bells form the floating rotor assembly used by the kit.

XC3 Engineering Caliper Carriers

Custom XC3 Engineering caliper brackets position the AP Racing CP9660 calipers correctly around the larger 368mm rotors.

The brackets are precision machined and anodised, with Chemi Black mounting hardware supplied as part of the kit.

Correct caliper positioning is critical when adapting motorsport braking components to a production vehicle, making the application-specific carrier an essential part of the conversion.

Floating Motorsport Rotor Assembly

The kit includes AP Racing bobbin hardware to connect the BTCC friction rings to the XC3 rotor bells.

A floating rotor system allows the friction ring to expand as temperatures increase during heavy braking.

This helps manage the thermal stresses generated during repeated high-load use and is widely used in motorsport braking systems where rotor temperatures can become extremely high.

Braided Brake Lines

Braided brake lines are included with the conversion.

Compared with conventional rubber brake hoses, braided lines are designed to reduce hose expansion under hydraulic pressure.

This can help provide a firmer and more consistent pedal feel, particularly during repeated heavy braking where brake temperatures rise significantly.

Raybestos ST45 Brake Pads

The standard kit is supplied with ex-BTCC Raybestos ST45 brake pads.

Like the rotors, these are previously used motorsport components selected to keep the package as cost-effective as possible.

Raybestos ST45 is a proven racing compound suited to track days, clubsport, endurance-style use and repeated heavy braking.

Typical characteristics include:

• Consistent mid-to-high friction
• Predictable brake response
• Strong modulation
• Stable performance during repeated hard braking
• Operating capability up to approximately 700°C rotor temperature
• Relatively rotor-friendly characteristics for a racing compound

For track-day and clubsport builds where consistency and manageable wear are important, ST45 is an excellent all-round option.

Optional Project Mu H21 Brake Pads

Project Mu H21 pads are also available as an alternative.

Please contact us if you would prefer the kit supplied with H21 pads.

The H21 is a more aggressive competition-focused compound designed for very high braking temperatures and demanding motorsport use.

Typical characteristics include:

• Strong initial bite
• High fade resistance
• Stable high-temperature performance
• Approx. 200°C–850°C operating range
• Competition-focused friction characteristics
• Suitable for repeated high-load braking

For dedicated track cars, Time Attack builds or vehicles where maximum braking performance is the priority, the H21 may be the more appropriate option.

Raybestos ST45 vs Project Mu H21

Choosing the correct brake pad depends heavily on how the vehicle will be used.

Raybestos ST45 is generally better suited to drivers looking for a balance between braking performance, modulation, rotor wear and track-day usability.

It provides strong and predictable braking without being as aggressive as a more specialised high-temperature competition compound.

Project Mu H21 is aimed more heavily at motorsport.

It operates across a higher-temperature range and offers a more aggressive braking response, making it better suited to dedicated track cars and competition builds where maximum braking performance takes priority over refinement.

For mixed fast-road and track use, ST45 will generally be the more versatile choice.

For dedicated circuit use, H21 may offer greater performance at sustained high temperatures.

Used BTCC Rotor & Pad Information

Please be aware that the brake rotors and standard Raybestos ST45 pads supplied with this kit are previously used motorsport components.

The BTCC rotors have typically been used during a single session at a British Touring Car Championship event before being removed from competition use.

The rotors are inspected prior to supply to confirm that they remain in suitable working condition.

The brake pads are also previously used items.

Using these lightly used motorsport components helps keep the overall package considerably more cost-effective while still giving customers access to genuine competition-specification braking hardware.

Cosmetic markings, heat cycling and signs of previous use should therefore be expected.

Nickel Caliper Finish

This version of the XC3 BTCC Big Brake Kit is supplied with nickel-finish AP Racing CP9660 calipers.

The nickel finish gives the brake kit a distinctive competition-inspired appearance and is particularly well suited to builds where visible motorsport hardware forms part of the overall wheel and brake setup.

The finish does not change the fundamental CP9660 caliper architecture or braking function; it primarily differentiates this version visually from alternative caliper finishes.

Ideal for Track-Day & High-Performance Builds

The XC3 BTCC Big Brake Kit is particularly well suited to:

• VW Golf GTI MK7 track builds
• VW Golf R MK7 track builds
• Higher-powered Golf GTI and Golf R models
• Cars running semi-slick or high-grip tyres
• Track-day vehicles
• Clubsport builds
• Time Attack cars
• Performance road cars that see regular circuit use

As power and tyre grip increase, upgrading braking capability becomes increasingly important for maintaining repeatable performance.

Wheel Clearance

Due to the use of 368mm rotors and large AP Racing CP9660 calipers, wheel clearance must be considered before ordering.

Compatibility depends on:

• Wheel diameter
• Wheel width
• Wheel offset
• Spoke profile
• Internal barrel clearance

Wheel diameter alone does not guarantee caliper clearance.

If you are unsure whether your current wheels will clear the kit, please contact us before ordering.

Brake Fluid

For track use, the braking system should be paired with a suitable high-performance brake fluid capable of handling elevated temperatures.

Brake fluid should also be replaced regularly on vehicles that see frequent circuit use.

Even a high-performance brake kit can suffer from poor pedal consistency if the fluid reaches its boiling point.

Professional Installation

Professional installation is strongly recommended.

Correct installation should include:

• Caliper carrier installation
• Rotor bell and friction ring assembly
• Brake line installation
• Correct torque procedures
• Brake system bleeding
• Wheel clearance checks
• Pad and rotor inspection

The braking system is safety critical and should only be installed by a competent technician.

Made to Order

XC3 Engineering BTCC Big Brake Kits are made to order.

We aim to keep the individual components available wherever possible, but certain parts may occasionally be subject to a lead time.

Please contact us before ordering if you require confirmation of current availability or have a specific deadline.

Fitment

Suitable for:

• Volkswagen Golf GTI MK7
• Volkswagen Golf R MK7

Please confirm your exact vehicle specification before ordering.

If you're unsure whether this kit is suitable for your Golf, contact us and we'll be happy to help confirm fitment.

Kit Contents

The XC3 Engineering BTCC Big Brake Kit includes:

• 2x AP Racing CP9660 Pro 5000 Series R 6-piston nickel calipers
• 2x ex-BTCC 368mm x 36mm brake rotors
• XC3 Engineering custom anodised rotor bells
• XC3 Engineering custom anodised caliper brackets
• Chemi Black caliper bracket hardware
• Braided brake lines
• 2x AP Racing bobbin kits
• Ex-BTCC Raybestos ST45 brake pads

Project Mu H21 brake pads are also available as an alternative. Please contact us for this option.

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