Unlock serious track-day performance with the XC3 BTCC Big Brake Kit for the BMW M2, M3, and M4 F8X chassis platforms. Built around the motorsport-proven AP Racing CP9660 calipers and paired with premium CNC-machined brackets and bells, this complete package solves the native F8X front braking thermal weakness, providing stronger initial bite, absolute fade resistance, and highly consistent pedal feel under extreme track load.

Designed strictly for track, clubsport, or high-performance fast-road builds, this upgrade efficiently manages the heavy thermal energy generated by modern turbocharged BMW platforms. Crucially, this ultra-cost-effective package includes inspected, single-session ex-BTCC (British Touring Car Championship) 368mm rotors and race-spec brake pads, offering elite motorsport stopping power at a fraction of standard competition pricing.

Part Number: XC3_F8X_BBK_CP9660

Key Features

– Genuine AP Racing Pro 5000R Series CP9660 6-Piston Radi-CAL competition calipers
– Custom XC3 Engineering hard-anodized aluminum rotor bells and caliper brackets
– High-strength Chemi-black bracket mounting hardware and complete AP Racing Bobbin float kit
– Premium ex-BTCC 368mm x 36mm heavy-duty race rotors (single-session inspected components)
– Complete with braided stainless steel brake lines and professional motorsport brake pads

Benefits

– Virtually eliminates brake fade and fluid boiling under demanding circuit conditions
– Substantially improves pedal modulation, driver confidence, and deep-zone braking consistency
– Direct bolt-on replacement engineered explicitly to fit factory F8X front hubs flawlessly
– Massive cost savings by utilizing single-session BTCC team components checked to ensure peak structural integrity

Dimensions

– Rotor Dimensions: 368mm Diameter x 36mm Thickness
– Caliper Configuration: 6-Piston AP Racing Pro 5000R (CP9660)
– Pad Compound Options: Raybestos ST45 (Endurance/Clubsport) or Project Mu H21 (Competition Only)

FAQ

Q: What is the condition of the ex-BTCC rotors and brake pads?
A: To deliver elite performance at an accessible price point, the rotors and pads included in this kit are single-session components sourced directly from BTCC race teams. AP Racing does not sell this specific 368mm sizing to the public. Every component undergoes rigorous inspection to ensure full working order and structural safety before dispatch.

Q: Which pad compound should I choose between the Raybestos ST45 and Project Mu H21?
A: The Raybestos ST45 is a mid-to-high friction compound (operating up to 700°C) that offers an excellent balance of longevity, rotor friendliness, and predictable modulation—ideal for clubsport and track-day cars that still see street use. The Project Mu H21 is a highly aggressive carbon-ceramic competition-only compound (operating up to 850°C) designed for absolute maximum initial bite and high-heat endurance; it is noisier, dustier, and less suited for cold street driving.

Q: Does this kit void my warranty if installed at home?
A: Because this is a high-performance motorsport braking system, installation must be carried out by a trained automotive professional. Failure to provide proof of professional installation may void the lifetime structural warranty on the custom brackets and bells.

Fitment

– BMW F87 M2 (2016-2021)
– BMW F87 M2 Competition (2018-2021)
– BMW F80 M3 (2015-2018)
– BMW F82 M4 Coupe (2015-2020)
– BMW F83 M4 Convertible (2015-2020)
Note: Fits standard vehicles equipped with OEM front hubs. Kits are custom made-to-order; please contact us directly if you require immediate dispatch availability.

If you are unsure on fitment, please message us with your registration or VIN and we will confirm compatibility before purchase.