Checking Brake Discs For Minimum Thickness

Information 

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Minimum thickness of PCCB brake disc

• For perforated brake discs, the minimum thickness -X- must always be measured on the inner or outer friction surface track -arrows-. 
• Wear limit: The brake disc minimum thickness is stamped on the brake disc hub (example: Min. Th. 33.7 mm). 

1. Measure brake disc thickness -X-  .
   1. 1.1  Measure the brake disc thickness -X-  close to the outer or inner friction surface track -arrows-  at least three different points -A, B, C-  offset by 120°. A commercially available micrometer screw or a brake disc gauge is a suitable measuring tool.

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Measuring points for brake disc thickness, shown on a grey cast-iron brake disc