Test Values And Wear Limits For 19-Inch Brake System (Cayenne Turbo/Cayenne Gts)
WARNING: This page is about a different variant/trim than selected.
Information
Depending on the extent of wear on grey cast-iron brake discs, two condition criteria can make replacement necessary:
- Formation of cracks at advanced stage on the brake disc friction surfaces.
- Minimum brake disc thickness is not retained due to wear (material erosion due to friction).
Information
- Replace brake discs once the maximum wear dimension has been reached.
- Re-machining of brake discs is not permitted!
| Location | Description | Type | Basic value | Tolerance |
|---|---|---|---|---|
| Pad thickness, front | Wear limit 2 mm | approx. 9.7 mm | ||
| Pad thickness, rear | Wear limit 2 mm | approx. 8.8 mm | ||
| Brake disc thickness, front | New | 38 mm | ||
| Brake disc thickness, rear | New | 28 mm | ||
| Brake disc wear dimension, front | 36 mm | |||
| Brake disc wear dimension, rear | 26 mm | |||
| Lateral runout of brake disc, maximum | 0.03 mm | |||
| Lateral runout of wheel hub, maximum | 0.02 mm | |||
| Lateral runout of brake disc when installed, maximum | 0.06 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
- Damage due to lack of use (rusting). This causes vibrations in the steering wheel, noises and brake pedal pulsation.
- 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.