AUDI RS6 4K CERAMIC BRAKE SYSTEM BRAKES BRAKES CALERS DISCS
The Audi RS6 (4K/C8) Carbon Ceramic Brake (CCB) system is widely regarded as one of the most powerful braking setups ever fitted to a production wagon. For the 4K platform, Audi moved to a massive 10-piston front architecture that is shared with the Lamborghini Urus and Bentley Bentayga.
Technical Specifications
1. Front Axle Setup
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Calipers: Akebono 10-Piston Aluminum Monoblock. These are some of the largest calipers in the automotive industry.
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Discs: $440\text{mm} \times 40\text{mm}$ Carbon Ceramic.
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Part Numbers (Reference):
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Left Disc: 4K0.615.301.D (or latest revision)
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Right Disc: 4K0.615.302.D
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Calipers: 4K0.615.107 / 4K0.615.108
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2. Rear Axle Setup
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Calipers: Single-piston floating caliper with integrated electronic parking brake (EPB) actuator.
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Discs: $370\text{mm} \times 30\text{mm}$ Carbon Ceramic.
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Part Numbers (Reference):
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Left Disc: 4K0.615.601.L
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Right Disc: 4K0.615.602.L
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System Advantages & Fitment
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Weight Savings: Moving from the standard 420mm steel RS6 brakes to the 440mm ceramics saves approximately 34kg (75lbs) of unsprung mass across all four corners.
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Wheel Clearance: Because of the $440\text{mm}$ front rotor and the 10-piston caliper height, 21-inch wheels are the absolute minimum. Most factory ceramic-equipped RS6s ship with 22-inch wheels to ensure adequate cooling flow around the caliper.
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Brake Fluid: Requires high-performance DOT 4 or DOT 5.1 fluid with a high dry boiling point ($>300\text{°C}$) to match the heat capacity of the ceramic discs.
Commercial Profile for Buy Mustang parts Ltd
This is a premier “Tier 1” inventory item. If you are preparing a listing for the 2021+ RS6 C8 (4K) complete set, here are the key details to highlight:
| Selling Point | Description |
| Cross-Platform | Mention compatibility with the RS7 (4K8) and potential retrofits for the Lamborghini Urus or Bentley Bentayga (with bracket verification). |
| Thermal Capacity | Virtually zero brake fade even under repeated high-speed stops from $300\text{km/h}+$. |
| Visual Impact | Available factory colors typically include Grey, Red, or Blue high-temp paint with the “Audi Ceramic” script. |
| Condition Check | For used sets, check for the minimum wear indicators (the three small circles on the disc surface). If these are pitted or recessed, the disc is nearing the end of its service life. |
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