Technical Data - 911 Turbo/GT3/GT3 RS
Operating brake (foot brake):
- Dual-circuit brake system with brake-circuit division per axle.
- Internally ventilated and perforated grey cast iron brake discs on front and rear axle.
- Six-piston monobloc calliper on front axle and four-piston calliper on rear axle.
- The brake callipers are painted red for visual differentiation.
- Porsche Stability Management (PSM 8.0) on the 911 Turbo (as standard).
- Traction Control (TC) on the 911 GT3/911 GT3 RS (as standard) up to 2009 model. As of 2010 model, PSM (Porsche Stability Management) with sporty setup can be switched off completely in two steps.
| Location | Description | Type | Basic value | Tolerance 1 | Tolerance 2 |
|---|---|---|---|---|---|
| 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 |