BMW 3 Series E30

since 1983-1994 release

Repair and operation of the car

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, the 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.

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, the driver can not 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:

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