WARNING: Brake fluid contains polyglycerol esters and polyglycerol. Avoid contact with eyes. Wash hands thoroughly after handling brake fluid. If brake fluid gets into eyes, flush eyes with cold running water for 15 minutes. If irritation persists, seek medical attention. If brake fluid is swallowed, drink water and induce vomiting. Seek immediate medical attention. Failure to follow these instructions may result in injury.
A diaphragm type vacuum brake booster is:
- independent node
- mounted on the body bulkhead on the engine side
- using the vacuum in the engine intake manifold and atmospheric pressure as an energy source
- equipped with a check valve to temporarily maintain pressure in the event of a decrease in vacuum
Active brake booster
The active brake booster is installed on vehicles with the directional stability function. When the directional stability function is activated, the electronic control unit of the directional stability program activates the electromagnetic valve located in the brake booster. As a result, atmospheric pressure acts on the back side of the membrane, and at the same time, the pressure on the suction side of the pump increases by approximately 10 bar without the brake pedal being pressed.
Shown is a right-hand drive vehicle (similar for left-hand drive vehicles)
| Pos. | Spare Part No | Name |
| 1 | Solenoid valve |
| Pos. | Spare Part No | Name |
| 1 | Brake fluid reservoir | |
| 2 | Vacuum brake booster | |
| 3 | Pusher | |
| 4 | Master brake cylinder |