Checking Brake Discs For Minimum Thickness

Information 

• For perforated brake discs, the minimum thickness -X- must always be measured on the inner or outer friction surface track -arrows-  .
  Fig 1: Identifying Minimum Thickness Of PCCB Brake Disc

  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
• Wear limit: The minimum brake disc thickness is stamped on the brake-disc chamber (e.g. Min. Th. 37.7 mm). 
  • Measure the brake disc thickness -X-  with a suitable micrometer screw or a brake disc gauge at the inner and outer friction surface tracks -arrows-  .