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+)

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.

• Front Left Disc: 4M8.615.301.C (or revision D)

• Front Right Disc: 4M8.615.302.C (or revision D)

• Rear Discs: 4M0.615.601.AD / 4M0.615.602.J

• Calipers: Available in Red (PR-1ZU), Blue (PR-1ZV), or Grey (PR-1ZP).

  • Example Front Red RH: 4M8.615.108.C

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

• 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.

• 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

• Service Life: Under typical road use, the discs are designed to last 300,000km+.

• 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.