Test Values And Wear Limits For Pccb Brake System
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Information
Depending on the wear of PCCB brake discs, the following condition criteria can make replacement necessary:
- Advanced stages of surface changes in the brake disc friction surfaces.
- Minimum brake disc thickness is not retained due to wear (material erosion due to friction).
- Check the friction surfaces using> VAS 6813 - PCCB brake disc tester.
Information
The PCCB brake disc must not be machined.
| Location | Description | Type | Basic value | Tolerance |
|---|---|---|---|---|
| Pad thickness, front | Wear limit 2 mm | Dimension | 8.4 mm | |
| Pad thickness, rear | Wear limit 2 mm | Dimension | 11.3 mm | |
| Maximum lateral runout of brake disc | Control value | 0.03 mm | ||
| Maximum lateral runout of wheel hub | Control value | 0.03 mm | ||
| Maximum lateral runout of brake disc when installed | Control value | 0.06 mm |
Possible complaints
- Brake disc becomes distorted as a result of serious driving.
- Too much lateral runout when new brake discs are fitted on dirty or distorted wheel hubs.
Procedure
- Check brake disc for cracks, lateral failure, thickness tolerance, flatness and surface roughness using > VAS 6813 - PCCB brake disc tester.
- Replacing brake disc