Replacing Brake Discs (Notes/Decision-Making Aid)

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2012 Porsche Cayman, 2012 Porsche Boxster, 2011 Porsche Cayman, 2011 Porsche Boxster, and 2010 Porsche Cayman. However, it is still accessible from the selected car via links, so may be relevant.

When replacing brake discs as a result of wear (see WEAR ASSESSMENT ) both brake discs must be replaced on an axle!

Irrespective of wear, a brake disc change can be necessary on the brake disc friction surfaces due to edge damage! In such cases, only one brake disc may need to be replaced if the friction area surface of the other PCCB brake disc is still completely OK →Checking brake discs for edge damage.

Make sure not to confuse modern brake discs -B- (used on the Boxster S/Cayman S since start of production) and original brake discs -A- (911 Carrera 4S, 911 Turbo, 911 GT2, 911 GT3 - up to model year 2005). Distinguishing feature: Twice as many bars between the friction surfaces on modern brake discs -B- and different perforation bore pattern.

Modern discs -B- also have wear indicator plates in the friction surfaces (at three places, each offset by 120°) and the wear limit (minimum brake disc thickness) has been changed. The minimum brake disc thickness is stamped on the brake-disc chamber (e.g. Min. Th. 33.7 mm).

Only use modern brake discs -B- on the Boxster S/Cayman S (987).

The following general rule applies to PCCB brake discs: Different types cannot be used on the same axle -A and B- . Different types can be used on the front axle and rear axle -A and B- .

Fig 1: Identifying Original And Modern Brake Discs

Courtesy of PORSCHE CARS NORTH AMERICA, INC.