AUDI RSQ8 Q8 RS CERAMIC CERAMIC BRAKE SYSTEM BRAKES
The Audi RSQ8 (4M8) Carbon Ceramic Brake system is the highest-specification braking package available for the VAG SUV platform. It is engineered to manage the significant kinetic energy of a $2,300\text{kg}$ vehicle, sharing its fundamental “10-piston” architecture with the Lamborghini Urus and Bentley Bentayga.
System Specifications (2020–2026+)
| Component | Front Axle | Rear Axle |
| Caliper Type | Akebono 10-Piston Monoblock | Single-Piston Floating (with EPB) |
| Disc Size | $440\text{mm} \times 40\text{mm}$ | $370\text{mm} \times 30\text{mm}$ |
| Material | Carbon Fiber Silicon Carbide (CCB) | Carbon Fiber Silicon Carbide (CCB) |
| Weight (Rotor) | approx. $10.5\text{kg}$ | approx. $6.0\text{kg}$ |
Key Part Numbers & Identification
When managing this inventory for Buy Mustang parts Ltd, accuracy is critical due to the physical similarities with the RS6 system but differing offsets.
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Front Left Disc:
4M8.615.301.C(or revisionD) -
Front Right Disc:
4M8.615.302.C(or revisionD) -
Rear Discs:
4M0.615.601.AD/4M0.615.602.J -
Calipers: Available in Red (PR-1ZU), Blue (PR-1ZV), or Grey (PR-1ZP).
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Example Front Red RH:
4M8.615.108.C
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Technical & Commercial Highlights
1. The “Urus” Cross-Compatibility
The RSQ8 ceramic rotors and the 10-piston calipers are physically interchangeable with those on the Lamborghini Urus. In the luxury parts market, listing these as “RSQ8 / Urus” compatible significantly increases the target audience and justified market value.
2. Performance vs. Steel
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Weight: The ceramic system removes approximately 34kg (75lbs) of unsprung mass compared to the factory $420\text{mm}$ steel setup. On a large SUV, this transformation is most noticeable in “turn-in” sharpness and mid-corner stability.
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Thermal Limit: The CCB discs maintain a stable friction coefficient even at $900\text{°C}$, whereas steel rotors will significantly fade or warp under the same thermal load from a high-speed SUV deceleration.
3. Maintenance & Longevity
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Service Life: Under typical road use, the discs are designed to last 300,000km+.
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Inspection Tip: When assessing “New Take-off” or used stock, check the three circular wear indicators on the disc face. They should be flush with the surface; if they are pitted or dark, the disc has reached its thermal limit regardless of thickness.
Inventory Recommendation
Since you currently have a 2021 RS6 C8 ceramic set in inventory, be aware that while the calipers are largely the same 10-piston Akebono units, the mounting brackets and rotor offsets can differ between the RS6 (Sedan/Avant) and the RSQ8 (SUV). Always verify the 4M8 (RSQ8) vs 4K0 (RS6) prefix before finalizing a sale to ensure a bolt-on fit for your customers.
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