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 may be necessary due to edge damage on the brake disc friction surfaces.
In such cases, only one brake disc may need to be replaced if the friction surface of the other PCCB brake disc is still perfectly OK.

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