Seat Leon Cupra 5F – BTCC Big Brake Kit – AP Racing CP9660 Complete Upgrade | XC3 Engineering
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XC3 Engineering BTCC Big Brake Kit – SEAT Leon Cupra 5F
Upgrade the braking performance of your SEAT Leon Cupra 5F 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 components with XC3 precision-engineered rotor bells and caliper brackets.
The result is a high-capacity braking package designed to improve thermal management, consistency and confidence under repeated hard use.
Why Choose the XC3 BTCC Big Brake Kit?
The standard Leon Cupra 5F braking system can become a limiting factor once the car is driven harder, especially with increased power, higher-grip tyres or repeated track use.
Potential benefits of the XC3 BTCC setup include:
- Improved braking consistency
- Increased thermal capacity
- Better resistance to brake fade
- Stronger repeatability under heavy use
- AP Racing six-piston calipers
- Floating BTCC rotor design
- Motorsport-derived brake pad options
- 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 calipers are widely used in serious performance and motorsport braking systems thanks to their strong combination of rigidity, braking control and repeatable performance.
Potential benefits include:
- Strong pedal response
- Consistent pad pressure
- High braking capacity
- Suitable for repeated track use
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 compared with a smaller road-focused brake setup.
The larger rotor size helps manage the heat generated during:
- Repeated high-speed stops
- Long track sessions
- High-grip tyre use
- Aggressive road driving
Floating Rotor Design
The floating bobbin assembly allows the brake disc to expand in a controlled way as temperatures increase.
Potential benefits include:
- Improved thermal behaviour
- More consistent braking
- Reduced thermal stress
- Better repeatability during demanding use
XC3 Anodised Rotor Bells
XC3 Engineering anodised rotor bells are included to correctly mount the BTCC brake rotors to the Leon Cupra 5F front hub assembly.
They are designed to provide:
- Accurate rotor positioning
- Strong structural support
- Lightweight construction
- Reliable performance under load
XC3 Anodised Caliper Brackets
The supplied XC3 caliper brackets position the AP Racing CP9660 calipers correctly relative to the 368mm brake rotors.
Accurate bracket design is essential to maintain:
- Correct caliper alignment
- Proper pad sweep
- Consistent disc positioning
- Reliable braking geometry
AP Racing Floating Bobbin Hardware
AP Racing bobbin kits are supplied as part of the package.
These correctly connect the floating brake rotor to the XC3 bell and allow the disc assembly to operate as intended.
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 more consistent and direct pedal feel.
Chemi Black High-Tensile Hardware
High-tensile Chemi Black bracket hardware is included for a strong and secure installation.
Ex-BTCC Raybestos ST45 Brake Pads
The kit includes inspected ex-BTCC Raybestos ST45 brake pads.
These provide a motorsport-derived friction option suited to demanding braking conditions.
Because the pads are ex-BTCC components, some cosmetic signs of prior motorsport use should be expected.
Project Mu H21 Pads Available on Request
Project Mu H21 pads are also available on request for customers looking for an alternative brake pad option.
Pad choice can be tailored around:
- Road versus track use
- Desired bite level
- Temperature range
- Pedal feel
- Consumable preference
Improved Thermal Capacity
Repeated hard braking generates substantial heat.
The combination of:
- 368 × 36 mm rotors
- Floating disc construction
- AP Racing CP9660 calipers
- Motorsport brake pads
creates a braking package designed to handle higher thermal loads more effectively.
Improved Braking Consistency
One of the key advantages of a larger motorsport-derived brake setup is repeatability.
The XC3 kit is designed to maintain more consistent braking throughout:
- Longer track sessions
- Repeated hard stops
- Higher-speed driving
- Aggressive fast-road use
Reduced Risk of Brake Fade
As brake temperature rises, standard braking systems can begin to lose consistency.
The increased rotor mass, floating construction and motorsport caliper design help create a more stable braking platform under repeated load.
Ex-BTCC Rotor & Pad Condition
The supplied rotors and Raybestos ST45 pads are inspected ex-BTCC motorsport components.
This gives customers 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:
- Fast-road Leon Cupra 5F builds
- Trackday cars
- Clubsport setups
- Higher-power builds
- Semi-slick tyre setups
- Motorsport-inspired projects
Lifetime Warranty
XC3-manufactured components are covered by the XC3 Lifetime Warranty.
This provides additional confidence in the durability and engineering of the rotor bells and caliper brackets.
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:
- SEAT Leon Cupra 5F
What's Included?
- 2 x AP Racing CP9660 Pro 5000 R six-piston calipers
- 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 Raybestos ST45 brake pads
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