Coating On The PCCB Brake Discs (Potential Causes)

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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 Bores (Perforations) In Brake Disc Friction Surface

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 -see pictureFig 1- in the brake discs must not be blocked. Unblock them if necessary. → 465102 CHECKING FRONT 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 (see also GENERAL INFORMATION ON REPLACEMENT OF PCCB BRAKE DISCS DUE TO WEAR ). The perforation bores -see pictureFig 1- must not be blocked.