Checking Front Brake Disc (Minimum Thickness)

Information 

Normally, brake discs are used until the maximum wear dimension is reached.

• > 4600TW TECHNICAL DATA/BRAKE WEAR LIMITS 
• Brake discs must not be reworked/machined. 

As the press-on force of the brake piston on the brake pad varies in magnitude, different areas of wear occur on the friction surface. There are basically two different wear areas on the brake disc:

-LHP vehicle -  Outer and inner wear area.

-RHP vehicle -  Central wear area.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Wear areas A and B

The central wear area -RHP vehicle -  is the area with the highest degree of wear.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Wear area B

Measure the brake discs with a suitable micrometer at a minimum of three different places (A, B, C  ), offset by 120°.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Measuring points for brake disc thickness