The BMW G80 M3 and G82/G83 M4 represent the pinnacle of current M-division engineering, yet many vehicles were delivered from the factory with standard compound steel brakes. For owners looking to enhance thermal capacity and reduce unsprung mass, BMW offers an official M Carbon Ceramic Brake (CCB) retrofit kit. This guide details the specific part numbers, technical requirements, and performance shifts associated with this upgrade.
Contents
- Key Context
- Structured Analysis
- Practical Checklist
- CTA
- FAQ
- Source Notes
- Professional Disclaimer
Key Context
The M Carbon Ceramic Brake system is designed specifically for high-stress environments, such as repeated high-speed braking on a race circuit. Unlike the standard steel rotors, which can suffer from heat soak and fading, the CCB system utilizes a carbon fiber reinforced silicon carbide (C/SiC) composite. This material maintains a consistent friction coefficient at temperatures that would cause traditional brakes to fail. For the G8x platform, this retrofit is a comprehensive package that replaces the calipers, rotors, pads, and necessary mounting hardware.
Structured Analysis
1. Primary Part Numbers and Kit Identification
The central part number for the BMW G80 M3 and G82/G83 M4 Carbon Ceramic Brake retrofit kit is 34-10-8-855-466.
This kit is marketed as a complete solution for the current generation of M3 and M4 models, including Standard, Competition, and xDrive variants. While individual components like rotors and pads have their own specific sub-part numbers for replacement, the retrofit kit bundles the necessary gold-painted six-piston front calipers and single-piston rear calipers required to accommodate the larger ceramic discs.
2. Technical Specifications and Weight Savings
The most significant advantage of the CCB retrofit is the reduction in unsprung and rotational mass.
* Weight Reduction: The kit shaves approximately 42 lbs (19.05 kg) of weight from the vehicle compared to the standard M compound brakes.
* Front Rotor Size: The kit features 16-inch (approx. 400mm) front rotors.
* Thermal Stability: The ceramic composite is far more resistant to corrosion and thermal deformation, leading to a "long-life" design when used primarily on the street.
3. Installation and Compatibility Requirements
Installing the 34-10-8-855-466 kit is not a simple "bolt-on" procedure without secondary considerations.
* Wheel Fitment: Due to the 16-inch front rotor and large caliper volume, specific wheel clearances are required. Generally, 19-inch wheels are the minimum, though many 19-inch aftermarket wheels may still interfere with the caliper barrel; 20-inch wheels are the standard recommendation for guaranteed clearance.
* Software Coding: The DSC (Dynamic Stability Control) and ABS modules must be recoded to the "Carbon Ceramic" brake map. This adjustment is vital because the friction characteristics and heat dissipation of ceramic discs differ from steel, and the brake-by-wire system in the G8x platform must account for these variables to ensure proper pedal feel and safety interventions.
4. Maintenance and Replacement Value Context
While the initial retrofit kit is an investment in performance, long-term maintenance of CCB systems often leads owners to look at replacement rotor options. For reference, when these rotors eventually reach their wear limit (measured by weight or surface oxidation), a direct-fit replacement from ForzaCCB provides a localized cost benchmark.
For the G8x front rotor size (approx. 400mm), the GT Spec matched pair is priced at $2,100 ($1,050 per rotor before shipping). If the specific fitment falls into the Track Spec (410mm+), the price is $2,350 per matched pair ($1,175 per rotor). These figures represent the component cost direct from the manufacturer. In contrast, purchasing individual replacement rotors through a dealership network often involves significant markups due to the distribution chain. Shipping and duties (DDP) for these matched pairs generally add approx. $150/rotor depending on the destination and local taxes.
Practical Checklist
- Verify Chassis: Ensure your vehicle is a G80 (Sedan), G82 (Coupe), or G83 (Convertible).
- Check Wheels: Confirm your current wheel set (especially winter sets) provides enough barrel clearance for 400mm rotors and the larger gold calipers.
- Confirm Kit Contents: Ensure the 34-10-8-855-466 kit includes the brake booster/master cylinder components if required for your specific production month, as some early G8x models may need hardware adjustments beyond the calipers and rotors.
- Plan for Coding: Arrange for a technician with BMW ISTA or authorized coding software to update the vehicle’s VO (Vehicle Order) to reflect the CCB installation.
Recommended Next Step
Looking to plan the right brake package for BMW owners comparing M3 and M4 setups? Browse our BMW Collection to compare vehicle-specific carbon ceramic rotor and upgrade options.
FAQ
Does the retrofit kit include rear calipers?
Yes, the official BMW retrofit kit includes the gold-painted calipers for both the front and rear axles to match the CCB aesthetic and functional requirements.
Can I use my existing brake pads with the CCB rotors?
No. Carbon ceramic rotors require specific friction material. Using pads designed for steel rotors will damage the ceramic surface and result in poor braking performance.
Is the brake-by-wire system affected?
The G8x M3/M4 utilizes an integrated braking system. The retrofit requires a software update so the electronics can correctly manage the pressure curves associated with ceramic discs.
What is the expected lifespan of the rotors in the 34-10-8-855-466 kit?
Under standard street driving conditions, these rotors can last over 100,000 miles. However, heavy track usage will significantly accelerate the oxidation process, requiring more frequent monitoring of rotor weight and surface condition.
Explore fitment-focused options here: BMW Collection.
Related reading for owners comparing similar setups: Genuine BMW G80 M3 and G82/G83 M4 Carbon Ceramic Brake Retrofit Kit Guide.
Source Notes
- Source: https://www.bmwpartspros.com/oem-parts/bmw-bmw-oem-carbon-ceramic-brake-retrofit-kit-34108855466
- Source: https://cotswoldherefordparts.com/products/genuine-bmw-g80-g82-g83-m3-m4-carbon-ceramic-brake-retrofit-kit-34108855466
Professional Disclaimer
All third-party trademarks, brand names, and model names are the property of their respective owners. References are for identification only and do not imply affiliation or endorsement. Performance results may vary based on installation quality and driving conditions. Always have brake components installed by a certified professional.