Information On The Test Steps
WARNING: This page is about a different car, the 2018 Porsche Macan and 2017 Porsche Macan. However, it is still accessible from the selected car via links, so may be relevant.
Checking involves the following tasks:
- Determining current actual values (wear condition) using tester VAS 6813 (at the three measurement markings). Aligning/positioning tester VAS 6813 -1
- using a laser beam -2
- at the measurement marking.
Observe the required conditions! See: → 465102 CHECKING FRONT PCCB BRAKE DISCS (WEAR ASSESSMENT USING TEST EQUIPMENT VAS 6813) - SECTION ON "CHECKING"
Positioning tester on PCCB brake disc
- Visual inspection of the brake disc friction surfaces for surface changes.
Flaking/fractures as a result of unusual usage conditions (e.g. stone chip damage). Max. 1.0 cm2 permitted!
Surface roughness.
Surface roughness (Rk), max. 80 μm permitted since this affects braking comfort (noises), braking behaviour/pedal pressure and brake pad service life.
NOTE:- Checking of the minimum brake disc thickness is no longer necessary (measurement no longer shown on brake disc hub).
NOTE:- Irrespective of wear, a brake disc may need to be changed due to edge damage on the brake disc friction surfaces .
- In this case, only one brake disc can be replaced if the measured value (determined using test equipment VAS 6813) and the friction surface of the other PCCB brake disc are still perfectly OK .
- Check brake discs for edge damage -see figure
- (damage due to improper use).
Edge damage on PCCB brake disc (shown as an example)
- Max. permissible width/depth = 2 mm (0.08 inches)
- Max. permitted length = 10 mm (0.39 inches)
- Max. 3 damaged edge areas permissible