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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 >> General Information On Replacing Worn PCCB Brake Discs

General Information On Replacing Worn PCCB Brake Discs

Three criteria governing the condition of the parts can make replacement necessary depending on the wear of PCCB brake discs: 

  1. Surface changes in the brake disc friction surfaces (material fatigue/wear) at an advanced stage (indication of wear: connected friction surface damage > 1 cm2 ).
  2. Surface roughness of the brake disc friction surfaces too great (roughness depends on mileage and load).
  3. Brake disc minimum thickness is not attained due to wear (material erosion due to friction).
    • In practice, all three forms of brake disc erosion usually occur.
    • Only in rare cases (as a result of long-term motor-racing brake loads/very high temperatures on the friction surfaces), surface changes can progress so quickly that the brake discs may need to be changed earlier than planned.
    • Brake discs that have turned blue at the brake-disc chamber and/or brake callipers that have turned a strong brown colour are clear indications of high loads over a long period of time, e.g. on the race circuit.
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