BMW M3 E90 E92 E93 BTCC Big Brake Kit – AP Racing CP9660 368mm Front Brake Upgrade | XC3 Engineering
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XC3 Engineering BTCC Big Brake Kit – BMW M3 E90 / E92 / E93
Upgrade the braking performance of your BMW E9x M3 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 E9x M3 is already a highly capable performance platform, but repeated heavy braking can expose the limits of the standard front brake setup.
Higher speeds, high-grip tyres and longer sessions all generate more heat and place greater demand on the pads and discs.
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 response 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 Grey
- Nickel Plated
Anodised Grey provides a motorsport-style appearance, while Nickel Plated 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 the heat generated 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
Optional Anti-Rattle Clips
Optional anti-rattle clips are available for customers who want to reduce the characteristic noise associated with floating brake hardware.
This allows the setup to retain the benefits of a floating disc while making it more suitable for road-driven cars.
XC3 Anodised Rotor Bells
XC3 anodised aluminium rotor bells are included to correctly mount the 368mm BTCC rotors to the factory BMW front hubs.
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 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.
Chemi Black High-Tensile Hardware
High-tensile Chemi Black caliper bracket hardware is included.
This provides a strong and secure mounting solution for the conversion.
Ex-BTCC Pagid RSX Brake Pads
The kit includes inspected ex-BTCC Pagid RSX brake pads.
These provide a motorsport-derived friction option suited to serious performance 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 factory 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 Pagid RSX 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.
Designed for OEM Front Hubs
The kit is designed for BMW E9x M3 models using standard OEM front hubs.
No alternative hub conversion is required.
10% Off Future Consumables
Customers purchasing an XC3 Big Brake Kit receive 10% off future replacement brake consumables.
This includes:
- Brake pads
- Brake rotors
- Rotor bells
- Service hardware
This helps reduce long-term running costs for cars that regularly see track use.
Designed & Manufactured in the UK
XC3 Engineering designs and manufactures the vehicle-specific rotor bells and caliper brackets in the UK.
These components are developed around:
- Correct rotor positioning
- Accurate caliper alignment
- Proper pad sweep
- Real-world track use
Lifetime Warranty
XC3-manufactured components are covered by the XC3 Lifetime Warranty.
This applies to the components manufactured by XC3 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 checks should include:
- Caliper alignment
- Rotor alignment
- Hardware torque
- Brake hose routing
- Pad sweep
- Wheel clearance
- Full brake system bleeding
Wheel Clearance
Wheel clearance must be checked before ordering, especially with aftermarket wheels.
Compatibility can depend on:
- Wheel diameter
- Spoke profile
- Wheel offset
- Barrel clearance
Vehicle Fitment
Compatible with:
- BMW E90 M3
- BMW E92 M3
- BMW E93 M3
Designed for vehicles using OEM front hubs.
What's Included?
- 2 x AP Racing CP9660 Pro 5000 R six-piston calipers
- Choice of Anodised Grey or Nickel Plated 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
- Optional anti-rattle clips
- 1 x Pair braided front brake lines
- Chemi Black high-tensile bracket hardware
- Ex-BTCC Pagid RSX brake pads
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