Cracks (Stress-Relief Microstructure) In The Brake Disc Friction Surface
WARNING: This page is about a different car, the 2024 Porsche 911, 2023 Porsche 911, and 2022 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.
Information
Stress-relief microstructure in PCCB brake disc friction surfaces
- Due to the composition of different materials in the friction layer and support body, the friction surfaces have an non-critical crack pattern (stress-relief microstructure). Individual relaxation cracks sometimes run along the perforated bores.
- The stress-relief microstructure results from the way in which the brake disc surface is manufactured and does not pose a risk to safety. There is also no danger of the friction layers flaking off from the support body because the friction layers are virtually free of internal stresses as a result of the stress-relief microstructure.
- The stress-relief microstructure is sometimes clearly visible in new brake discs and can be significantly different on the brake disc hub side and the side opposite the hub.