| Brake booster (vacuum) |
All (Turbo, GT3/GT3 RS) |
Tandem/diameter |
9 inches |
|
|
| Brake booster transmission ratio (i) |
Turbo |
Factor |
5.5 |
|
|
| Brake booster transmission ratio (i) |
GT3/GT3 RS |
Factor |
3.5 |
|
|
| Diameter of brake master cylinder, front/rear |
All |
Diameter |
26.99/26.99 mm |
|
|
| Brake master cylinder stroke, front/rear |
All |
Dimension |
20.5/15.5 mm |
|
|
| Brake disc diameter, front |
|
Diameter |
350 mm |
|
|
| Brake disc diameter, front |
GT3 as of 2010 model |
Diameter |
380 mm |
|
|
| Brake disc diameter, rear |
|
Diameter |
350 mm |
|
|
| Effective brake disc diameter, front |
|
Diameter |
284 mm |
|
|
| Effective brake disc diameter, front |
GT3 as of 2010 model |
Diameter |
315.8 mm |
|
|
| Effective brake disc diameter, rear |
|
Diameter |
292 mm |
|
|
| Piston diameter in six-piston brake calliper, front |
Turbo and GT3/GT3 RS up to 2009 model |
Diameter |
2 x 38/2 x 32/2 x 28 mm |
|
|
| Piston diameter in six-piston brake calliper, front |
GT3 as of 2010 model |
Diameter |
2 x 32/2 x 30/2 x 28 mm |
|
|
| Piston diameter in four-piston brake calliper, rear |
All |
Diameter |
4 x 34 mm |
|
|
| Effective brake pad area, front |
|
Area |
448 cm2 |
|
|
| Effective brake pad area, front |
GT3 as of 2010 model |
Area |
428 cm2 |
|
|
| Effective brake pad area, rear |
|
Area |
248 cm2 |
|
|
| Total brake pad area |
|
Area |
696 cm2 |
|
|
| Total brake pad area |
GT3 as of 2010 model |
Area |
676 cm2 |
|
|
| Pad thickness, front |
|
Measured value |
approx. 12.0 mm |
|
|
| Pad thickness, front (wear limit) |
|
Measured value |
2 mm |
|
|
| Pad thickness, rear |
|
Measured value |
approx. 12.0 mm |
|
|
| Pad thickness, rear (wear limit) |
|
Measured value |
2 mm |
|
|
| Brake disc thickness, new (front) |
|
Measured value |
34 mm |
|
|
| Brake disc thickness, new (rear) |
|
Measured value |
28 mm |
|
|
| Minimum brake disc thickness after machining, front |
Brake disc can only be reworked symmetrically, i.e. equally from both sides! |
Measured value |
32.6 mm |
|
|
| Minimum brake disc thickness after machining, rear |
Brake disc can only be reworked symmetrically, i.e. equally from both sides! |
Measured value |
26.6 mm |
|
|
| Brake disc wear limit, front |
|
Measured value |
32.0 mm |
|
|
| Brake disc wear limit, rear |
|
Measured value |
26.0 mm |
|
|
| Peak-to-valley surface roughness of brake disc after machining (max.) |
|
Measured value |
0.006 mm |
|
|
| Thickness tolerance of brake discs (max.) |
|
Measured value |
0.02 mm |
|
|
| Lateral runout of brake disc (max.) |
|
Measured value |
0.03 mm |
|
|
| Lateral runout of wheel hub (max.) |
|
Measured value |
0.03 mm |
|
|
| Lateral runout of brake disc when installed (max.) |
|
Measured value |
0.06 mm |
|
|
| Pushrod play |
Measured at brake pedal plate |
Measured value |
approx. 1 mm |
|
|
| Diameter of parking-brake drum |
Parking brake/hand brake (drum brake acting mechanically on both rear wheels) |
Diameter |
180 mm |
|
|
| Diameter of parking-brake drum, wear limit |
|
Diameter |
181 mm |
|
|
| Width of parking-brake shoe |
|
Measured value |
25 mm |
|
|
| Thickness of parking-brake pad |
|
Measured value |
4.5 mm |
|
|
| Thickness of parking-brake pad, wear limit |
|
Measured value |
2 mm |
|
|
| Brake booster diameter (vacuum) |
All (Turbo, GT3/GT3 RS) |
Tandem/diameter |
9 inches |
|
|
| Brake booster transmission ratio (i) |
Turbo |
Factor |
5.5 |
|
|
| Brake booster transmission ratio (i) |
GT3/GT3 RS |
Factor |
3.5 |
|
|
| Diameter of brake master cylinder, front/rear |
All |
Diameter |
26.99/26.99 mm |
|
|
| Brake master cylinder stroke, front/rear |
All |
Dimension |
20.5/15.5 mm |
|
|
| Brake disc diameter, front |
|
Diameter |
380 mm |
|
|
| Brake disc diameter, rear |
|
Diameter |
350 mm |
|
|
| Effective brake disc diameter, front |
|
Diameter |
315.8 mm |
|
|
| Effective brake disc diameter, rear |
|
Diameter |
292 mm |
|
|
| Piston diameter in six-piston brake calliper, front |
Turbo |
Diameter |
2 x 36 mm |
|
|
| Piston diameter in six-piston brake calliper, front |
Turbo |
Diameter |
2 x 32 mm |
|
|
| Piston diameter in six-piston brake calliper, front |
Turbo |
Diameter |
2 x 28 mm |
|
|
| Piston diameter in six-piston brake calliper, front |
GT3/GT3 RS |
Diameter |
2 x 32 mm |
|
|
| Piston diameter in six-piston brake calliper, front |
GT3/GT3 RS |
Diameter |
2 x 30 mm |
|
|
| Piston diameter in six-piston brake calliper, front |
GT3/GT3 RS |
Diameter |
2 x 28 mm |
|
|
| Piston diameter in four-piston brake calliper, rear |
All |
Diameter |
4 x 34 mm |
|
|
| Effective brake pad area, front |
|
Area |
448 cm2 |
|
|
| Effective brake pad area, rear |
|
Area |
248 cm2 |
|
|
| Total brake pad area |
|
Area |
696 cm2 |
|
|
| Pad thickness, front |
|
Measured value |
approx. 12.0 mm |
|
|
| Pad thickness, front (wear limit) |
|
Measured value |
2 mm |
|
|
| Pad thickness, rear |
|
Measured value |
approx. 12.0 mm |
|
|
| Pad thickness, rear (wear limit) |
|
Measured value |
2 mm |
|
|
| Brake disc thickness, new (front) |
|
Measured value |
34 mm |
|
|
| Brake disc thickness, new (rear) |
|
Measured value |
28 mm |
|
|
| Brake disc wear limit, front |
Minimum brake disc thickness (wear limit) is stamped on the brake-disc chamber. Example: Min. Th. 33.7 mm |
Measured value |
mm (Read value on brake-disc chamber) X.XX |
|
|
| Brake disc wear limit, rear |
Minimum brake disc thickness (wear limit) is stamped on the brake-disc chamber. Example: Min. Th. 27.7 mm |
Measured value |
mm (Read value on brake-disc chamber) X.XX |
|
|
| Wear limit: Surface changes in front and rear brake discs |
Wear limit: Connected surface fracture > 1 cm2
and/or surface roughness of brake disc > 80 micrometer. Replace PCCB brake discs on each axle. |
Surface changes |
Values and procedure for: checking front 46 51 02 PCCB brake discs/checking rear 46 54 02 PCCB brake discs. |
|
|
| Thickness tolerance of brake discs (max.) |
|
Measured value |
0.02 mm |
|
|
| Lateral runout of brake disc (max.) |
|
Measured value |
0.03 mm |
|
|
| Lateral runout of wheel hub (max.) |
|
Measured value |
0.03 mm |
|
|
| Lateral runout of brake disc when installed (max.) |
|
Measured value |
0.06 mm |
|
|
| Pushrod play |
Measured at brake pedal plate |
Measured value |
approx. 1 mm |
|
|
| Diameter of parking-brake drum |
Parking brake/hand brake (drum brake acting mechanically on both rear wheels) |
Diameter |
180 mm |
|
|
| Diameter of parking-brake drum, wear limit |
|
Diameter |
181 mm |
|
|
| Width of parking-brake shoe |
|
Measured value |
25 mm |
|
|
| Thickness of parking-brake pad |
|
Measured value |
4.5 mm |
|
|
| Thickness of parking-brake pad, wear limit |
|
Measured value |
2 mm |
|
|