Test Values And Wear Limits For Macan Brake System
WARNING: This page is about a different variant/trim than selected.
Information
Depending on the wear of grey cast-iron brake discs, two condition criteria can make replacement necessary:
- Advanced stages of cracking on the brake disc friction surfaces.
- Minimum brake disc thickness is not retained due to wear (material erosion due to friction).
| Location | Description | Type | Basic value | Tolerance |
|---|---|---|---|---|
| Pad thickness, front | Wear limit 2 mm | Pad quality, ECE | 9.48 mm | |
| Pad thickness, front | Wear limit 2 mm | Pad quality, NAR | 9.68 mm | |
| Pad thickness, rear | Wear limit 2 mm | 11.6 mm | ||
| Brake disc wear dimension, front | 34 mm | |||
| Brake disc wear dimension, rear | 20 mm | |||
| Lateral runout of brake disc, max. | 0.03 mm | |||
| Lateral runout of wheel hub, max. | 0.03 mm | |||
| Lateral runout of brake disc when installed, max. | 0.06 mm |
- 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.
- If necessary, (depending on the actual brake disc thickness and the brake disc wear limit) machine the brake disc using one of the disc brake dressing machines approved by Porsche. For a list of recommended disc brake dressing machines, see Service Information.
- The brake disc must only be reworked symmetrically, i.e. evenly from both sides! Read the operating instructions for the disc brake dressing machine!
Information
Depending on the wear of grey cast-iron brake discs, two condition criteria can make replacement necessary:
- Advanced stages of cracking 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 | Pad quality ECE/wear limit 2 mm | Dimension | 9.5 mm | |
| Pad thickness, front | Pad quality NAR/wear limit 2 mm | Dimension | 9.7 mm | |
| Pad thickness, rear | Wear limit 2 mm | Dimension | 11.6 mm | |
| Brake disc wear dimension, front | Control value | 36 mm | ||
| Brake disc wear dimension, rear | Control value | 26 mm | ||
| Maximum lateral runout of brake disc | Control value | 0.03 mm | ||
| Maximum lateral runout of wheel hub | Control value | 0.02 mm | ||
| Maximum lateral runout of brake disc when installed | Control value | 0.06 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
- Replacing brake disc
- Brake discs must not be reworked!