Coating On The PCCB Brake Discs (Potential Causes)

WARNING: This page is about a different car, the 2010 Porsche Cayenne, 2009 Porsche Cayenne, and 2008 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.

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.
Perforation bores -see Fig 1- in the brake discs must not be blocked. Clear them if necessary → Checking Information On PCCB Brake Discs .
In the event of brake pad wear, the brake discs can still be used provided the brake discs satisfy all wear criteria General information on replacement of PCCB brake discs due to wear. The perforation bores -see Fig 1- must not be blocked.