Mercedes S-Class W-220

since 1998 release

Repair and operation of the car

Mercedes W220
+ Mercedes-Benz cars of the class S (W220)
+ Operation manual
+ Routine maintenance
+ Engine
+ Cooling system and heating
+ Power supply system and release
+ Engine electric equipment
+ Automatic transmission
+ Power shafts
- Brake system
   Arrangement of components of the amplifier of emergency brake application of BAS
   Arrangement of components of the ESP system
   Dual main brake cylinder
   Vacuum amplifier
   Brake support
   Check of thickness of a brake disk and overlays of brake shoes
   Removal and installation of brake shoes
   Removal and installation of a forward cable of the drive of the parking brake
   Adjustment of the parking brake
   System of anti-blocking of brakes of ABS, antistrange system - an arrangement of elements
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Schemes of electric equipment

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Vacuum amplifier



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

4. Turn off 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 A7/7x1, A7/7x2 socket from the BAS control unit or on models with ESP disconnect the socket from the switch of the electromagnetic valve and the sensor of movement of a diaphragm of BAS on the vacuum amplifier. On models about BAS and ESP, the BAS control unit it is integrated with the ESP control unit.
6. Remove the lower cover of the dashboard.
7. Disconnect a returnable spring of a brake pedal.
8. Take a clamp and a finger 26.
9. Turn off 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 brake pedal to reduce pressure in the vacuum amplifier.
2. Disconnect a tester from the vacuum amplifier.

3. Attach the 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. Start the engine and create pressure of 0.75 - 0.80 bars, pressing and releasing an accelerator pedal. If reach vacuum on value much below, than it is required, or vacuum immediately decreases, then 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 the required 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 specified in Specifications.