Test Values/Wear Limits - 911 Turbo/GT3/GT3 RS
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2013 Porsche 911, 2012 Porsche 911, 2011 Porsche 911, 2010 Porsche 911, and 2009 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.
Information
Depending on the wear of cast iron brake discs, two condition criteria can make replacement necessary:
- Cracking in the holed (perforated) brake disc friction plates is in an advanced state.
- Minimum brake disc thickness is not retained due to wear (material erosion due to friction).
| Location | Description | Type | Basic value | Tolerance 1 | Tolerance 2 |
|---|---|---|---|---|---|
| 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 |