Product Overview
Upgrade the braking performance of your BMW E9X M3 with the XC3 BTCC Big Brake Kit featuring AP Racing CP9668 Pro 5000 R six-piston endurance calipers. Built around ex-BTCC 368mm x 36mm floating rotors, 25mm brake pads and XC3 precision-engineered mounting components, this complete front brake upgrade is designed for fast road, track day and endurance use.
The CP9668 caliper uses a deeper 25mm pad compared with the 18mm pad used in the CP9660, giving increased pad volume, longer consumable life and improved suitability for repeated high-temperature braking.
Key Features
- AP Racing CP9668 Pro 5000 R six-piston endurance calipers
- Choice of Anodised Grey or Nickel Plated caliper finish
- Full-depth 25mm brake pad format
- Ex-BTCC 368mm x 36mm floating brake rotors
- XC3 6082-T6 billet aluminium rotor bells
- XC3 6082-T6 billet aluminium caliper brackets
- AP Racing floating bobbin hardware
- Optional anti-rattle clips available
- Braided front brake lines
- Chemi black high-tensile bracket hardware
-
Choice of 25mm Endurance Brake Pads
- Designed for BMW E9X M3 with OEM front hubs
- XC3 manufactured components covered by our Lifetime Warranty
Product Description
The BMW E9X M3 is a highly capable road and track platform, but repeated heavy braking can quickly expose the limits of the factory braking system. Long braking zones, high-grip tyres, increased vehicle speed and repeated heat cycles all place greater demand on the front brakes, leading to increased pad wear, reduced consistency and a greater risk of brake fade.
The XC3 BTCC Big Brake Kit solves this with a motorsport-derived braking package built around 368mm x 36mm floating BTCC rotors and AP Racing CP9668 endurance calipers. The larger rotor size increases thermal capacity, while the floating bobbin assembly allows controlled rotor expansion under temperature. The CP9668’s 25mm pad format gives more friction material volume than the CP9660, making it better suited to longer sessions and endurance-focused use.
Customers can choose between Anodised Grey calipers for a motorsport-style finish or Nickel Plated calipers for a premium, corrosion-resistant appearance. Optional anti-rattle clips are also available for customers who want to reduce floating rotor hardware noise while retaining the benefits of a floating disc assembly.
XC3-designed bells and caliper brackets ensure correct rotor positioning, caliper alignment and pad sweep on the E9X M3 chassis. The supplied rotors are inspected ex-BTCC components, allowing customers to access high-level motorsport hardware at a more cost-effective price point than a fully new equivalent setup. Some cosmetic marks and signs of previous motorsport use should be expected.
Why Buy from XC3
XC3 Engineering designs and manufactures key brake kit components in the UK, including our vehicle-specific rotor bells and caliper brackets. Every XC3-manufactured component is developed for accurate fitment, correct brake geometry and real-world track use.
Our manufactured components are covered by the XC3 Lifetime Warranty, giving you confidence that your brake kit is supported by proper engineering, not just supplied as a collection of parts.
All XC3 Big Brake Kit customers also receive 10% off future replacement brake consumables, including pads, rotors, bells and service hardware, helping reduce long-term running costs.
What’s Included
- 2 x AP Racing CP9668 six-piston endurance calipers
- Choice of Anodised Grey or Nickel Plated caliper finish
- 2 x ex-BTCC 368mm x 36mm floating brake rotors
- 2 x XC3 6082-T6 billet aluminium rotor bells
- 2 x XC3 6082-T6 billet aluminium caliper brackets
- 2 x AP Racing floating bobbin kits
- Optional anti-rattle clips
- 1 x pair braided front brake lines
- Chemi black high-tensile mounting hardware
-
1 x set of Endurance Brake Pads
Brake Pad Comparison Table — CP9668 Endurance Caliper
| Brake pad |
Modulation / control |
Bite level |
Best for this customer |
| Pagid Racing RSL29 |
Very good |
Low-medium / medium |
Best for customers who want consistency, long pad life, good disc life and confidence over longer track sessions. A strong all-round endurance and track day option for customers who do not want an overly aggressive pad. |
| PFC 11 |
Very good |
High |
Best for customers who want more bite, sharper response and strong braking power. Well suited to harder track driving, sprint use and customers who prefer a more aggressive pedal feel than RSL29. |
| Ferodo DSUNO |
Very good |
High |
Best for customers generating more brake temperature who want a serious race pad with strong torque, good control, long life and disc-friendly behaviour. A strong choice for heavy cars and demanding track use. |
Quick Customer Guide
| Customer use |
Best pad choice |
Why |
| Best all-round endurance option |
Pagid Racing RSL29 |
Consistent, progressive and confidence-inspiring over longer sessions. |
| Customer wants longest pad/disc life balance |
Pagid Racing RSL29 / Ferodo DSUNO |
Both are strong options for reducing consumable wear while maintaining serious performance. |
| Customer wants more bite and response |
PFC 11 |
Sharper initial bite and stronger pedal response than RSL29. |
| Heavy BMW / hard track use |
Ferodo DSUNO / Pagid Racing RSL29 |
Better suited to repeated heavy braking and high temperatures. |
| Sprint use / aggressive driving style |
PFC 11 |
Stronger bite and response for customers who want a race-feel pad. |
| Long sessions / endurance use |
Pagid Racing RSL29 / Ferodo DSUNO |
More suited to consistency, control and pad life over extended use. |
| Customer wants easiest pad to drive |
Pagid Racing RSL29 |
Progressive and less aggressive, making it easier to modulate. |
Big Brake Kit Customer Benefit
Customers who purchase an XC3 Big Brake Kit receive 10% off future replacement consumables, including replacement brake pads, discs, bells and hardware. This helps reduce ongoing running costs and makes maintaining your brake kit more affordable over time.
Vehicle Fitment
- BMW M3 E90
- BMW M3 E92
- BMW M3 E93
For vehicles using OEM front hubs. Professional installation required. Wheel clearance must be checked before ordering, especially with aftermarket wheels. These kits may be made to order depending on stock availability.
