VW Golf GTI / R MK5 MK6 – BTCC Big Brake Kit – AP Racing CP9660 Complete Upgrade | XC3 Engineering

XC3 Engineering BTCC Big Brake Kit – VW Golf GTI / R Mk5 / Mk6

Upgrade the braking performance of your VW Golf GTI or Golf R Mk5/Mk6 with the XC3 Engineering BTCC Big Brake Kit, built around AP Racing CP9660 Pro 5000 R six-piston calipers and 368 × 36 mm ex-BTCC floating brake rotors.

Designed for fast-road, trackday and clubsport use, this complete front brake upgrade combines proven motorsport-derived hardware with XC3 precision-engineered rotor bells and caliper brackets.

The result is a high-capacity braking package designed to improve thermal management, braking consistency and confidence under repeated hard use.

Why Choose the XC3 BTCC Big Brake Kit?

The standard Golf GTI and Golf R braking systems are capable for road use, but repeated heavy braking can expose their limits once power, tyre grip and track use increase.

Potential benefits of the XC3 BTCC setup include:

• Increased thermal capacity
• Improved braking consistency
• Better resistance to brake fade
• Stronger repeatability under heavy use
• AP Racing six-piston calipers
• Floating BTCC rotor design
• Motorsport-derived brake pads
• Suitable for fast-road, trackday and clubsport builds

AP Racing CP9660 Pro 5000 R Calipers

At the heart of the kit are AP Racing CP9660 Pro 5000 R six-piston calipers.

These are designed for serious performance and motorsport use, offering strong rigidity, consistent pad pressure and reliable braking performance under repeated load.

Potential benefits include:

• Strong pedal response
• Good modulation
• Consistent braking force
• High-temperature capability
• Proven track performance

Choice of Caliper Finish

The AP Racing CP9660 calipers are available in:

• Anodised finish
• Nickel-plated finish

The anodised option provides a motorsport-inspired appearance, while the nickel-plated option offers a more premium finish with strong corrosion resistance.

368 × 36 mm Ex-BTCC Floating Rotors

The kit includes 368 × 36 mm ex-BTCC floating brake rotors.

These motorsport-derived discs provide increased thermal capacity and are designed to cope with repeated high-energy braking.

The larger rotor size helps manage heat during:

• Long track sessions
• Repeated high-speed stops
• Semi-slick tyre use
• Aggressive fast-road driving

Floating Rotor Design

The floating bobbin system allows the rotor to expand in a controlled way as temperatures increase.

Potential benefits include:

• Improved thermal behaviour
• More consistent braking
• Reduced thermal stress
• Better repeatability under heavy use

XC3 Anodised Rotor Bells

XC3 anodised aluminium rotor bells are included to correctly mount the 368mm BTCC rotors to the Golf front hub assembly.

They are designed to provide:

• Accurate rotor positioning
• Lightweight construction
• Strong structural support
• Reliable operation under load

XC3 Anodised Caliper Brackets

The supplied XC3 caliper brackets position the AP Racing CP9660 calipers correctly relative to the brake rotors.

Accurate bracket geometry helps maintain:

• Correct caliper alignment
• Proper pad sweep
• Consistent disc positioning
• Reliable braking geometry

AP Racing Floating Bobbin Hardware

AP Racing bobbin kits are supplied with the conversion.

These provide the interface between the floating brake rotor and the XC3 rotor bell, allowing the disc assembly to function correctly through repeated heat cycles.

Braided Front Brake Lines

A pair of braided front brake lines is included.

Braided hoses can help reduce hose expansion under pressure and contribute to a firmer, more consistent brake pedal feel.

High-Tensile Mounting Hardware

Chemi Black high-tensile bracket hardware is included.

This provides a strong and secure mounting solution for the caliper brackets.

Ex-BTCC Brake Pads

The kit includes inspected ex-BTCC brake pads.

These provide a motorsport-derived friction option suited to demanding road and track use.

Because the pads are ex-BTCC components, cosmetic marks and visible signs of prior use should be expected.

Improved Thermal Capacity

Repeated heavy braking creates substantial heat.

The combination of:

• 368 × 36 mm rotors
• Floating disc construction
• AP Racing CP9660 calipers
• Motorsport brake pads

creates a braking system designed to manage these loads more effectively than the standard front brake setup.

Improved Braking Consistency

One of the major advantages of the system is repeatability.

The kit is designed to maintain more consistent braking throughout:

• Longer track sessions
• Repeated hard stops
• High-speed braking zones
• Aggressive fast-road use

Reduced Risk of Brake Fade

As brake temperatures rise, standard brake systems can become less consistent.

The larger rotor size and motorsport-derived componentry help create a more stable braking platform under repeated load.

Ex-BTCC Rotor & Pad Condition

The supplied brake rotors and pads are inspected ex-BTCC motorsport components.

This provides access to high-level competition hardware at a more cost-effective price point than an equivalent fully new setup.

Some cosmetic marks and signs of previous motorsport use should be expected.

Ideal for Performance & Track Builds

This kit is particularly well suited to:

• VW Golf GTI Mk5 track builds
• VW Golf R Mk5 performance builds
• VW Golf GTI Mk6 trackday cars
• VW Golf R Mk6 clubsport setups
• Higher-power builds
• Semi-slick tyre setups

Lifetime Warranty

XC3-manufactured components are covered by the XC3 Lifetime Warranty.

This provides additional confidence in the rotor bells and caliper brackets supplied within the kit.

Warranty terms and conditions should be checked before purchase.

Professional Installation Required

Professional installation is strongly recommended.

Performance braking systems are safety-critical and should be fitted by a suitably experienced technician.

Installation should include checks of:

• Caliper alignment
• Rotor alignment
• Hardware torque
• Brake hose routing
• Pad sweep
• Wheel clearance
• Full system bleeding

Wheel Clearance

Wheel clearance must be checked before ordering, especially with aftermarket wheels.

Compatibility can depend on:

• Wheel diameter
• Spoke profile
• Offset
• Barrel clearance

Vehicle Fitment

Compatible with:

• VW Golf GTI Mk5
• VW Golf R Mk5
• VW Golf GTI Mk6
• VW Golf R Mk6

What's Included?

• 2 x AP Racing CP9660 Pro 5000 R six-piston calipers
• Choice of anodised or nickel-plated caliper finish
• 2 x Ex-BTCC 368 × 36 mm floating brake rotors
• 2 x XC3 anodised rotor bells
• 2 x XC3 anodised caliper brackets
• 2 x AP Racing floating bobbin kits
• 1 x Pair braided front brake lines
• Chemi Black high-tensile bracket hardware
• Ex-BTCC brake pads

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