Technical Data
| Leak Test, Engine Stopped Discharge vacuum reservoir by operating brake pedal firmly about 10 times | Approx. force on pedal | approx. 500 N | |
| Equal to approx. line pressure | approx. 28 | ||
| Max. pressure drop within 2 min. | 8 % | ||
| Brake Booster Function Test (with Engine Running) | Approx. force on pedal | approx. 200 N | |
| Equal to approx. line pressure | approx. 75 - 90 | ||
| Brake Lining | Different thicknesses | 0.01 mm | |
| Wear warning from residual lining thickness | 3.0 mm | ||
| Brake Disc (Front) | Minimum Thickness Minimum Thickness (MIN TH) Is Stamped In Brake Disc Shell | Ventilated | 20.4 mm |
| 540i | 28.4 mm | ||
| Max. Machining Limit (Except M models) M-models May Not Be Machined | Per Friction Ring Side | 0.8 mm | |
| Top Runout Of Brake Surface | Disc Installed Max. | 0.2 mm | |
| Disc Removed Max. | 0.04 mm | ||
| Surface Finish Of Braking Surface (fine Ground) | 0.5 | 3.5 ra u | |
| Diameter | Except 540i | 296 mm | |
| 540i | 324 mm | ||
| Brake Disc (Rear) | Minimum Thickness Minimum Thickness (MIN TH) Is Stamped In Brake Disc Shell | Solid | 8.4 mm |
| Ventilated | 18.4 mm | ||
| Max. Machining Limit (Except M models) M-models May Not Be Machined | Per Friction Ring Side | 0.8 mm | |
| Top Runout Of Brake Surface | Disc Installed Max. | 0.2 mm | |
| Disc Removed Max. | 0.04 mm | ||
| Surface Finish Of Braking Surface (fine Ground) | 0.5 - 3.5 ra u | ||
| Diameter | 298 mm | ||
| Parking Brake | Drum Diameter | 185 mm | |
| Max. Radial Runout Of Braking Surface | Max. | 0.1 mm | |
| Surface Finish Of Braking Surfaces (fine Ground) | 0.5 - 3.5 ra u | ||
| Min. Liner Thickness | 1.5 mm |