BMW 3 Series E30

since 1983-1994 release

Repair and operation of the car

- 1. Maintenance instruction
   1.1.2. Overall dimensions
   1.1.3. Driver's seat
   1.1.4. Dashboard
   1.1.5. Keys for the car equipped with an immobilizer
   1.1.6. Window regulators
   1.1.7. Safety cushions
   1.1.8. On-board computer
   1.1.9. Indexes
   1.1.10. Voltmeter
   1.1.11. Tachometer
   1.1.12. The counter of the total passable way
   1.1.13. Sound signal
   1.1.14. 3-staged automatic transmission
   1.1.15. 4-staged automatic transmission
   1.1.16. Mechanical transmission
   1.1.17. Emergency brake
   1.1.18. Car running in period
   1.1.19. Fuel
   1.1.20. Threefold catalytic converter
   1.1.21. Engine oil
   1.1.22. Brakes
   1.1.23. Rules of placement of freight in a luggage carrier
   1.1.24. Launch of the engine and driving
   1.1.25. Methods of driving
   1.1.26. Towage of the trailer
   1.1.27. Actions at refusal of launch of the engine
   1.1.28. A start order from the additional battery
   1.1.29. If the engine decayed during the movement
   1.1.30. Actions at an engine overheat
   1.1.31. Actions at a wheel puncture
   1.1.32. Rules of towing
   1.1.33. Check of pressure in tires
   1.1.34. Check of a state and replacement of tires
   1.1.35. Shift of wheels
   1.1.36. Installation of winter tires and chains
   1.1.37. Check of an external condition of the battery
   1.1.38. Battery charging
   1.1.39. Specifications
+ 2. Maintenance
+ 3. Engine
+ 4. Cooling system
+ 5. Heating and ventilation
+ 6. Fuel system
+ 7. Exhaust system
+ 8. Transmissions
+ 9. Coupling
+ 10. Brake system
+ 11. Running gear
+ 12. Body
+ 13. Electric equipment
+ 14. Useful tips


1.1.22. Brakes


The brake system with the main cylinder of tandem type

The car is equipped with double-circuit hydraulic system of brakes with the main cylinder of tandem type. At refusal of one contour braking is carried out by means of other contour, but at the same time the way of braking increases and the effort which needs to be put to a brake pedal increases. Besides, control lamp of refusal of brakes lights up.

Driving with one serviceable contour is forbidden. Immediately repair the refused hydraulic actuator.

Vacuum amplifier of brakes

It is intended for increase in effort to the piston of the main cylinder due to the depression created by the engine. If when driving the engine decays, then brakes work from pressing a pedal. In the amplifier vacuum which can be enough for 1–2 braking, but no more remains.


It is forbidden to press constantly a brake pedal at the decayed engine. By each pressing the depression reserve decreases.

Even at total disappearance of depression of a brake keep working capacity, but at the same time the effort which needs to be put to a pedal increases and the brake way increases.

Anti-blocking system (together with a control lamp)

The anti-blocking system is intended for a disinhibition of wheels at sharp braking or when braking on a slippery paving, increasing controllability the car in so critical situation.

The system begins to work at achievement of speed of the car of 10 km/h. At a speed less than 5 km/h the anti-blocking system ceases to work.

At once after launch of the engine, or after a start of motion, from a motor compartment clicks which mean the beginning of the mode of self-examination of anti-blocking system reach, but do not indicate malfunction.

During the work of anti-blocking system pulsations of a pedal of a brake can be felt and be listened noise. It is necessary to hold in this situation only a pedal, making a little bigger effort. It is forbidden to release and press a brake pedal. Brake pedal pulsations from anti-blocking system can indicate a dangerous condition of a paving. In spite of the fact that according to the destination the anti-blocking system increases controllability the car, all the same it is necessary to be careful at the movement, so overall performance of this system depends on a number of objective factors.

Efficiency of braking depends on coupling of tires with a paving.

At turn commission at great speed, or sharp maneuver, driver cannot always manage to drive on certain pavings, even at serviceable anti-blocking system.

Avoid the movement with high speed on the wet road. The anti-blocking system will not be able to eliminate sliding on a film of water and loss of coupling with a covering.

Always observe a distance to ahead the going transport. The brake way of the car equipped with anti-blocking system can exceed a brake way of the car without anti-blocking system in the following cases:

  – at movement along the uneven, covered with gravel or snow road;
  – at the movement with the chains established on wheels;
  – at movement along the bumpy road, or on an inclined track.

Control lamp

The control lamp of anti-blocking system lights up at turn of a key in situation On and later 3 sec. dies away.

Existence of one of the indications provided below testifies to malfunction of those details which condition is controlled by a lamp. In this case the car should be handed over immediately in service of car service:

  – lamp does not light up (as it is described above) or does not die away;
  – lamp lights up at the movement.

Even at faulty anti-blocking system of a brake will keep working capacity.

Indicators of wear of brake shoes

When wear of overlays of disk brakes exceeds norm, noise published by the wear indicator sounds.

If at the movement squeal or the howling sound sounds, then immediately address to service of car service for check or replacement of brake shoes.

Avoid a long trip when the indicator makes a sound.

Long driving with the brake shoes which are worn out to a limit will result in the accelerated wear of an expensive brake disk and to increase in effort to a pedal for preservation of a brake way.