Test Values And Wear Limits For Panamera V6/V8 PCCB Brake System
Information
The following condition criteria can make replacement necessary depending on the wear of the PCCB brake discs:
- Surface changes in the brake disc friction surfaces at an advanced stage.
- Minimum brake disc thickness is not retained due to wear (material erosion due to friction).
Information
The PCCB brake disc must not be machined.
| Location | Description | Type | Basic value | Tolerance 1 | Tolerance 2 |
|---|---|---|---|---|---|
| Pad thickness, front | Wear limit 2 mm | approx. 10.0 mm | |||
| Pad thickness, rear | Wear limit 2 mm | approx. 10.5 mm | |||
| Brake disc thickness, front | New | 38 mm | +0.1 mm | -0.1 mm | |
| Brake disc thickness, rear | New | 28 mm | +0.1 mm | -0.1 mm | |
| Brake disc wear dimension, front | 37.7 mm | ||||
| Brake disc wear dimension, rear | 27.7 mm | ||||
| Brake disc wear limit, front | Minimum brake disc thickness (wear limit) is stamped on the brake disc hub. Example: Min. Th. 37.7 mm | mm (Read value on brake disc hub) XX.X | |||
| Brake disc wear limit, rear | Minimum brake disc thickness (wear limit) is stamped on the brake disc hub. Example: Min. Th. 29.7 mm | mm (Read value on brake disc hub) XX.X | |||
| Peak-to-valley surface roughness of brake disc | New | 0.006 mm | |||
| Wear limit: Surface changes in front and rear brake discs | Wear limit: Connected surface fracture > 1 cm2 and/or surface roughness of brake disc > 80 micrometer. Replace PCCB brake discs on each axle. | Values and procedure for: 46 51 02 Checking front PCCB brake discs/46 54 02 Checking rear PCCB brake discs. | |||
| Lateral runout of brake disc, max. | 0.03 mm | ||||
| Lateral runout of wheel hub, max. | 0.02 mm | ||||
| Lateral runout of brake disc when installed, max. | 0.07 mm | ||||
| Pushrod play | Not adjustable | ||||
| Parking brake (foot-operated parking brake) | Drum brake acting electro-mechanically on both rear wheels | ||||
| Parking-brake drum diameter | 180 mm | ||||
| Brake shoe width | 30 mm | ||||
| Brake pad thickness | Wear limit 1 mm | 3 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, minimum thickness, lateral runout, thickness tolerance, flatness and surface roughness.