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Home >> Porsche >> 2009 >> Cayenne Base, Standard >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> 46 - Brakes - Brake Mechanics >> WM 465102 Checking Front PCCB Brake Disc (Wear Assessment) (All Models) >> Checking Information On PCCB Brake Discs >> Basic Information

Basic Information

Checking involves the following: 

  1. Visual inspection for surface changes in the brake disc friction surfaces and wear indicators. Indication of wear: Connected surface fracture > 1 cm2-arrow-  , without adding up smaller fractures → Checking Information On PCCB Brake Discs  .
    Fig 1: Locating Connected Surface Fracture
    G09419544Courtesy of PORSCHE CARS NORTH AMERICA, INC.
  2. Check surface roughness Rk of brake discs (max. 80 μm permitted) since this affects braking comfort (noises), braking behaviour/pedal pressure and brake-pad service life → Checking Information On PCCB Brake Discs  .
    Fig 2: Identifying Surface Roughness Of PCCB Brake Disc
    G09419545Courtesy of PORSCHE CARS NORTH AMERICA, INC.
  3. Check brake discs for minimum thickness -X-  . The minimum brake disc thickness (e.g. Min. Th. 37.7 mm) is stamped on the brake-disc chamber → Checking Information On PCCB Brake Discs  .
    Fig 3: Identifying Minimum Thickness X Of PCCB Brake Disc
    G09419546Courtesy of PORSCHE CARS NORTH AMERICA, INC.
  4. Check brake discs for edge damage -see Fig 4- (damage due to improper use) → Checking Information On PCCB Brake Discs  .
    Fig 4: Identifying Edge Damage On PCCB Brake Disc
    G09419547Courtesy of PORSCHE CARS NORTH AMERICA, INC.