General Information On Replacing Worn Pccb Brake Discs

WARNING: This page is about a different car, the 2014 Porsche Cayenne, 2013 Porsche Cayenne, 2012 Porsche Cayenne, and 2011 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.

Three criteria governing the condition of the parts can make replacement necessary depending on the wear on PCCB brake discs:

Surface changes in the brake disc friction surfaces (material fatigue/wear) at an advanced stage (indication of wear: associated friction surface damage > 1 cm² ).
Surface roughness of the brake disc friction surfaces too great (roughness depends on mileage and load).
Brake disc minimum thickness is not attained due to wear (material erosion due to friction).

In practice, all three forms of brake disc erosion usually occur.
Only in rare cases (as a result of long-term motor-racing brake loads/very high temperatures on the friction surfaces), can surface changes progress so quickly that the brake discs may need to be changed earlier than planned.
Brake discs that have turned blue at the brake disc hub and/or brake callipers that have turned a strong brown color are clear indications of high loads over a long period of time, e.g. on the race circuit.