Checking Brake Discs For Edge Damage

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:

Fig 1: Identifying PCCB Brake Disc Edge Damage

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

• Max. permissible width/depth = 2 mm (0.08 inches)
• Max. permitted length = 10 mm (0.39 inches)
• Max. 3 damaged edge areas permissible