Visual Characteristics Of Ceramic Brake Rotors

WARNING: This page is about a different car, the 2021 Audi S4 and 2021 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

Identifications on the Ceramic Brake Rotor on the Brake Rotor Cup

Fig 1: Identifying Ceramic Brake Rotor Data

Courtesy of AUDI OF AMERICA, LLC

Running Direction
Brake Rotor Production Date
- Example
Brake Rotor Minimum Thickness
- Example
- Wear limit. Refer to BRAKE ROTOR, WEIGHING - The minimum permitted brake rotor weight "min.weight" is engraved in the brake rotor cup -4-. .
Minimum Weight of Brake Rotor and Cup
- Example
Supplier
- Example
Brake Rotor Serial Production Number
- Example
Audi Part Number
- Example

Overview - Brake Rotor

Fig 2: Identifying Ceramic Brake Disc

Courtesy of AUDI OF AMERICA, LLC

Cooling Duct
Friction Surface
Base Material

The friction surface on a new brake rotor already has stress cracks which occur during the production process. These stress cracks are all different.

Fig 3: Identifying Stress Cracks In Ceramic Brake Disc

Courtesy of AUDI OF AMERICA, LLC

Stress cracks do not mean the ceramic brake rotor is faulty.
The stress cracks are somewhat visible and can be different from each other in strength.

-- Check the connection area on the brake rotor ring and brake rotor cup. Refer to CRACKS IN CERAMIC BRAKE ROTOR CONNECTION AREA .