Coating On The PCCB Brake Discs (Possible Causes)

The coating on the PCCB brake discs arises as a result of a high load and high temperatures, for example on a racing circuit. Check the following in such cases:

Fig 1: Identifying Coating On The PCCB Brake Discs

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Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Ventilation (brake cooling): All components are present, secured correctly and undamaged.
Brake pad quality: If the vehicle is used for race-track driving, use appropriate brake pads.
The perforation bores → Bores (perforations) in brake disc friction surface in the brake discs must not be blocked.

Unblock them if necessary. → 465402 CHECKING REAR PCCB BRAKE DISC (WEAR ASSESSMENT) - section on "Information".

In the event of brake pad wear, the brake discs can still be used provided the brake discs satisfy all wear criteria → 465402 CHECKING REAR PCCB BRAKE DISC (WEAR ASSESSMENT) - section on "Information". The perforation bores → Bores (perforations) in brake disc friction surface must not be blocked.