Mercedes S-Class W-220

1. Remove the main brake cylinder.
2. Remove supporting pump ASR.
3. Check the main brake cylinder on absence of damages and leaks.

4. Turn on or unhook a vacuum tube 8 from the vacuum amplifier 16. Press several times a brake pedal to reduce pressure in the vacuum amplifier.

5. Disconnect the socket A7/7kh1, A7/7kh2 from the BAS control unit or on models with ESP disconnect the socket from the switch of the electromagnetic valve and the sensor of moving of a diaphragm of BAS on the vacuum amplifier. On models from BAS and ESP, the BAS control unit it is integrated with the ESP control unit.
6. Remove the bottom cover of the dashboard.
7. Disconnect a returnable spring of a brake pedal.
8. Take a clamp and a finger 26.
9. Unscrew a nut 23 from an arm 22.
10. Remove the vacuum amplifier 16.
11. Check laying 16.

Installation is carried out as it should be, the return to removal.

1. Press a pedal of a brake to reduce pressure in the vacuum amplifier.
2. Disconnect a tester from the vacuum amplifier.

3. Attach a manometer 051 to a brake support with an adapter.

4. Attach the sensor of measurement of effort to pedals 060 on a brake pedal.
5. Get the engine and create pressure 0.75 - 0.80 bar, pressing and releasing an accelerator pedal. If will reach vacuum on value much below, than it is required, or the vacuum immediately decreases, the sealing ring between the vacuum amplifier and the main brake cylinder is damaged or it is necessary to check the valve in a vacuum tube.
6. Create demanded effort to pedals of an accelerator and read pressure in the line.
Pressure in a hydraulic actuator depending on pressure upon a pedal of a brake is given in Specifications.