Replacing Brake Discs (Notes/Decision-Making Aid)

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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 .

Ensure that brake discs manufactured using the modified technology -B- (used in the 911 Carrera 997 since production began) are not interchanged with the brake discs manufactured using the original technology -A- (911 Carrera 4S, 911 Turbo, 911 GT2, 911 GT3 - before model 2005). Distinguishing feature: Twice as many bars between the friction surfaces on modern brake discs -B- and different perforation bore pattern.

Fig 1: Identifying Original (A) And Modern (B) Brake Discs

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

In addition, the new technology -B- features little wear indicator plates on the friction surfaces (at three points, each arranged at 120° with respect to one another) and the wear limit (brake disc minimum thickness) has also been modified. The brake disc minimum thickness is stamped on the brake disc chamber (example: Min. Th. 33.7 mm).

Install only brake discs that have been manufactured using the new technology in the -B- 911 Carrera (997).

In general, the following applies to PCCB brake discs: A combination of the two technologies -A and B- on the same axle is not permitted! A front axle/rear axle mix of the two technologies -A and B- is possible.