Replacing Brake Discs (Instructions/Decision-Making Aid)

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When replacing brake discs as a result of wear (see WEAR ASSESSMENT ) both brake discs must be replaced on an axle!

Irrespective of wear, a brake disc change may be necessary due to edge damage on the brake disc friction surfaces! In this case, only one brake disc can be replaced if the friction surface of the other PCCB brake disc is still 'as new' → 465102 CHECKING FRONT PCCB BRAKE DISC (WEAR ASSESSMENT) .

The wear indicator plates (six on each brake disc) are arranged at three points close to the outer diameter, offset by 120 ° -arrows- . The three wear indicator plates on each friction surface (three on the inside and three on the outside) are positioned directly opposite each other. Each wear indicator is approx. 1.2 cm² . The wear indicators are barely visible on new brake discs.

Fig 1: Locating Wear Indicators

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

The minimum brake disc thickness (wear dimension) is stamped on the brake disc hub (e.g. Min. Th. 33.7 mm).