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Brake Booster and Master Cylinder Assembly Overview

• Complete brake master cylinder and brake booster can be replaced separately.





1 Brake booster

• On gasoline engines vacuum is supplied from intake manifold.

• On diesel engines, a vacuum pump is installed for vacuum.

• Function test

• With engine switched off, depress brake pedal firmly several times (to deplete vacuum in tool).

• Depress and hold brake pedal with average foot pressure and start engine. If brake booster is working properly, pedal will be felt to give noticeably under foot (booster assist becomes effective).

• If malfunctioning: replace as complete unit.

• Check valve (in vacuum hose) => [ check valve. ] .

Function test => [ check valve. ] .

• Disconnect from brake pedal => [ Brake Pedal to Brake Booster, Disconnecting and Connecting ] Brake Pedal to Brake Booster, Disconnecting and Connecting.

• Removing and installing => [ Brake Booster ] Brake Booster.

2 Cap

3 Brake fluid reservoir

4 Sealing plugs

• Coat with brake fluid and press into brake master cylinder

5 Retaining pin

• Insert through brake master cylinder

6 Brake master cylinder

• Cannot be serviced. Replace as complete unit if malfunctioning.

7 Self-locking hex nut, 20 Nm

8 Heat shield

9 Self-locking hex nut, 20 Nm

10 Seal

• Replace

11 Sealing plugs

12 Vacuum hose

• Insert in brake booster

13 Gasket

• For brake booster

14 Self-locking hex nut, 20 Nm

15 Boot

• Check for proper seat, danger of intake noises