Test Values And Wear Limits For PCCB (Cayenne Basic Model/Cayenne S/Cayenne Diesel/Cayenne Diesel S/Cayenne Hybrid)
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. 8.6 mm | |||
| Pad thickness, rear | Wear limit 2 mm | approx. 8.9 mm | |||
| Brake disc thickness, front | New | 38 mm | +0.1 mm | -0.1 mm | |
| Brake disc thickness, rear | New | 30 mm | +0.1 mm | -0.1 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 both sides of the 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 mechanically on both rear wheels | ||||
| Parking-brake drum Ø | Wear limit 211 mm | 210 mm | |||
| Brake shoe width | 30 mm | ||||
| Brake pad thickness | Wear limit 1 mm | 3 mm |
Possible complaints
- Too much lateral runout when new brake discs are fitted on dirty or distorted wheel hubs.
Procedure
- Check brake disc for minimum thickness, lateral runout, thickness tolerance, flatness and surface roughness.
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. 8.6 mm | |||
| Pad thickness, rear | Wear limit 2 mm | approx. 8.9 mm | |||
| Brake disc thickness, front | New | 38 mm | +0.1 mm | -0.1 mm | |
| Brake disc thickness, rear | New | 30 mm | +0.1 mm | -0.1 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 both sides of the 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 mechanically on both rear wheels | ||||
| Parking-brake drum Ø | Wear limit 211 mm | 210 mm | |||
| Brake shoe width | 30 mm | ||||
| Brake pad thickness | Wear limit 1 mm | 3 mm |
Possible complaints
- Too much lateral runout when new brake discs are fitted on dirty or distorted wheel hubs.
Procedure
- Check brake disc for minimum thickness, lateral runout, thickness tolerance, flatness and surface roughness.