Audi R8 4S ceramic brake system, brake calipers, brake discs
The Audi R8 (4S) Carbon Ceramic Brake (CCB) system is the high-performance braking flagship for the second-generation R8 (2016–2023). It shares its fundamental architecture and components with the Lamborghini Huracán, making parts highly sought after in the exotic car market.
Technical Specifications
| Component | Front Axle | Rear Axle |
| Caliper Type | Brembo 6-Piston Monoblock | Brembo 4-Piston Monoblock |
| Rotor Size | $380\text{mm} \times 38\text{mm}$ | $356\text{mm} \times 32\text{mm}$ |
| Rotor Material | Carbon Fiber Silicon Carbide | Carbon Fiber Silicon Carbide |
| PCD / Hub | $5 \times 112$ | $5 \times 112$ |
Critical Part Numbers (4S Generation)
For your inventory management at Buy Mustang parts Ltd, accuracy on these prefixes is vital because while they look similar to the older Gen 1 (42) parts, the offsets and mounting are different.
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Front Discs ($380\text{mm}$):
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Left:
4S0.615.301.A(or4S0.615.301.B) -
Right:
4S0.615.302.D
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Rear Discs ($356\text{mm}$):
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Left:
4S0.615.601.C -
Right:
4S0.615.602.B
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Calipers:
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Typical color options: Grey (Standard), Red, Yellow, or Blue with “Audi ceramic” script.
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Rear calipers for the 4S include a separate mechanical/electronic parking brake caliper (EPB) assembly.
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Fitment & Commercial Strategy
1. The Huracán Connection
The R8 4S ceramic rotors and calipers are a direct 1:1 match for the Lamborghini Huracán (LP610-4, LP580-2, EVO, STO). In the luxury secondary market, listing these as “R8 / Huracán Compatible” significantly increases their value and appeal to a broader range of exotic car owners.
2. Performance & Weight
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Mass Reduction: The CCB system reduces unsprung weight by approximately 20kg compared to the standard steel wavy-disc system. This is a primary selling point for customers focused on track performance and steering precision.
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Temperature: These discs are designed to operate at over 1000°C without fading, which is essential for mid-engine supercars during high-speed deceleration.
3. Condition & Inspection (For Inventory)
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Wear Measurement: Unlike steel rotors, ceramic discs do not wear by becoming thinner. They wear by losing mass (weight). Each rotor hat is stamped with a Minimum Weight (e.g., Min. Wt. 5850g). To verify the life of the part for a customer, you should weigh the disc on a digital scale.
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Surface Check: Inspect for “chipping” along the outer edge. While the surface is extremely hard, it is brittle. Even a small chip from an accidental wheel-hit during installation can render the rotor unsafe.
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