Note concerning bores (perforations) in the brake disc friction surface

CAUTION: PCCB (Porsche Ceramic Composite Brake): Danger of material damage (danger of damage to the brake discs) if improper work is performed on the bores in the brake disc friction surface!

Clean the bores on PCCB brake discs with high-pressure cleaning equipment (only if necessary). In doing so, observe the environmental and safety regulations!
Do not machine (boring or countersinking is not permissible)!

Use high-pressure cleaning equipment to clean or expose the bores in the brake disc friction surface.

Fig 1: Identifying Friction Surface
Courtesy of PORSCHE OF NORTH AMERICA, INC.