BMW 3 series E30

Since 1983-1994 of release

Repair and car operation

+ 1. The maintenance instruction
+ 2. Maintenance service
+ 3. The engine
+ 4. Cooling system
+ 5. Heating and ventilation
+ 6. Fuel system
+ 7. An exhaust system
+ 8. Transmissions
+ 9. Coupling
- 10. Brake system
   10.2. Specifications
   10.3. Antiblocking system (ABS)
   10.4. Колодки disk brakes
   10.5. A support of a disk brake
   10.6. A brake disk
   10.7. Колодки drum-type brakes
   10.8. The main cylinder of brakes
   10.9. The vacuum amplifier of brakes
   10.10. A cable () a manual brake
   10.11. Adjustment of a manual brake
   10.12. The mechanism of a manual brake
   10.13. A brake pedal
   10.14. The switch of a signal of braking
   10.15. Hoses and lines of a hydrodrive of brakes
   10.16. Removal of air from a hydrodrive of brakes
+ 11. A running gear
+ 12. A body
+ 13. An electric equipment
+ 14. A good advice

10.9. The vacuum amplifier of brakes

Returnable spring of a pedal of a brake (), a lock ring of an axis of a pedal (b) and an axis ()

On an insert the removed axis of a pedal and скоба axis fastenings is shown.

Drive of the vacuum amplifier

1. A dustproof cover

2. The holder

3. The screen

4. The air filter


1. On the idle engine press a brake pedal until then while the pedal course will not cease to vary.
2. Press and keep a pedal, then start the engine. If the pedal slightly goes downwards the cylinder is serviceable.

Tightness check

1. Start the engine and later 1–2 mines stop. Slowly press a pedal some times. If the first course of a pedal gradually decreases after the second or third time the vacuum amplifier is tight.
2. Press a brake pedal on the working engine and, keeping a pedal, stop the engine. If during 30 сек the pedal does not move, the vacuum amplifier is tight.

The faulty amplifier of brakes is subject to replacement.

Removal and installation

1. Remove the main brake cylinder.
2. Disconnect from the amplifier a vacuum hose.
3. From outside salon remove a box for trifles and the bottom left facing panels on the left side.
4. Remove скобу fastenings of an axis and remove a plug axis, disconnect a pusher from the lever (on cars with the right wheel) or from a pedal (on other cars). On cars with the left wheel also disconnect a returnable spring of a pedal of a brake.
5. Turn away four nuts of fastening (arrow) and get the vacuum amplifier from a motor compartment.
6. Check up a condition of the porous filter. If it is polluted, wash out it in a weak soap solution. It is not possible if to wash out, replace the filter.
7. Installation is carried out upside-down. Tighten nuts of fastening of the amplifier with the set moment. Before dressing a cover on the filter be convinced that dredging in the filter are displaced concerning dredging on демпфере on 180 .
8. Adjust distance And (distance from the centre of an axis of a plug on a pedal of a brake to a partition / of a wall of a motor compartment). Tighten a counternut, then adjust height and a free wheeling of a pedal of a brake, and also the switch of a signal of braking. Nuts of fastening of the amplifier tighten with the moment 22–24 Н.м.

The prevention

On а/м with the right wheel the brake pedal is on the right side of salon, it is connected to a left-hand side shaft. Draught adjustment is carried out on the left side, however the distance is measured on the pedal.

9. Establish the main cylinder and attach a vacuum hose.
10. Check up work of brakes.