Replacing Brake Discs (Decision-Making Aid)

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When replacing brake discs as a result of wear (see 465402 CHECKING REAR PCCB BRAKE DISC (WEAR ASSESSMENT) ) both brake discs must be replaced on an axle!

Irrespective of wear, a brake disc change can be necessary on the brake disc friction surfaces due to edge damage! In this case, only one brake disc can be replaced if the friction surface of the other PCCB brake disc is still 'as new' → 465402 CHECKING REAR PCCB BRAKE DISC (WEAR ASSESSMENT) - section on "Checking".

The wear indicator plates (six on each brake disc) are arranged close to the outer diameter, offset by 120 ° -arrows- at three points. The three wear indicator plates on each friction surface (3 on the inside and 3 on the outside) are positioned directly opposite each other. Each wear indicator is approx. 2 cm² . The wear indicators are barely visible on new brake discs.

Fig 1: Locating Brake Disc Wear Indicators

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

The minimum brake disc thickness (wear dimension) is stamped on the brake disc hub (example: Min. Th. 29.7 mm).