Replacing Brake Discs (Notes/Decision-Making Aid)
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.
Install modified technology brake discs only on the 911 Carrera (997), 911 Turbo (997), and 911 GT3/911 GT3 RS (997) -B- .
The following general rule applies to PCCB brake discs: A combination of the two technologies -A and B- on one axle is not permitted! A front axle/rear axle mix of the two technologies -A and B- is possible.
In addition, -B- modified technology brake discs also feature wear indicator plates on the friction surfaces. The wear indicator plates (six on each brake disc) are arranged close to the outer diameter, offset by 120 ° -arrows- at three points. The three wear indicator plates on each friction surface (3 on the inside and 3 on the outside) are positioned directly opposite each other. Each wear indicator is approx. 1.2 cm2 in size. The wear indicators are barely visible on new brake discs.
The wear limit (brake disc minimum thickness) is also different on -B- modified technology discs. The minimum brake disc thickness (wear dimension) is stamped on the brake disc hub (example: Min. Th. 33.7 mm).
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.
Install modified technology brake discs only on the 911 Carrera (997), 911 Turbo (997), and 911 GT3/911 GT3 RS (997) -B- .
The following general rule applies to PCCB brake discs: A combination of the two technologies -A and B- on one axle is not permitted! A front axle/rear axle mix of the two technologies -A and B- is possible.
In addition, -B- modified technology brake discs also feature wear indicator plates on the friction surfaces. The wear indicator plates (six on each brake disc) are arranged close to the outer diameter, offset by 120 ° -arrows- at three points. The three wear indicator plates on each friction surface (3 on the inside and 3 on the outside) are positioned directly opposite each other. Each wear indicator is approx. 1.2 cm2 in size. The wear indicators are barely visible on new brake discs.
The wear limit (brake disc minimum thickness) is also different on -B- modified technology discs. The minimum brake disc thickness (wear dimension) is stamped on the brake disc hub (example: Min. Th. 33.7 mm).