Checking Brake Discs For Edge Damage

WARNING: This page is about a different car, the 2014 Porsche Cayenne, 2013 Porsche Cayenne, 2012 Porsche Cayenne, and 2011 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.

Information

Irrespective of wear, a brake disc change can be necessary on the brake disc friction surfaces due to edge damage.
In such cases, only one brake disc may need to be replaced if the friction area surface of the other PCCB brake disc is still completely OK.

The following criteria apply to edge damage assessment:

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Edge damage on PCCB brake disc

Max. permissible width/depth = 2 mm
Max. permitted length = 10 mm
Max. 3 damaged edge areas permissible