Basic Information

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Checking involves the following:

Visual inspection for surface changes in the brake disc friction surfaces. Indication of wear: Connected surface fracture > 1 cm²-arrow- , without adding up smaller fractures.

Fig 1: Locating Brake Discs Fractured Surface
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Check surface roughness (Sr) of brake discs (max. 80 μm permitted) since this affects braking comfort (noises), braking behavior/pedal pressure and brake-pad service life.

Fig 2: Identifying PCCB Brake Disc Surface Roughness
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Check brake discs for minimum thickness -x- . The minimum brake disc thickness (e.g. Min. Th. 33.7 mm) is stamped on the brake-disc chamber.

Fig 3: Identifying PCCB Brake Disc Thickness
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Check brake discs for edge damage -see figure- (damage due to improper use).

Fig 4: Identifying PCCB Brake Disc Edge Damage
Courtesy of PORSCHE CARS NORTH AMERICA, INC.