E30 series BMW 3

since 1983-1994 of release

Repair and car operation

The scheme of double-circuit brakes (the option with disk lobbies and back brakes is shown) and a drive of the hand brake

Device of a forward brake

All cars are completed with forward disk brakes and also back disk or drum-type brakes. On all cars lobbies and back brakes are self-regulating. On some cars of late release the anti-blocking brake system (ABS system) is established.

Hydraulic system

The hydraulic system consists of two separate contours. For each of contours in the main brake cylinder the separate section is provided. If in one of contours there is a leak or other malfunction, other contour remains to workers.

Vacuum amplifier

The vacuum amplifier of brakes uses vacuum in a collector of the engine and atmospheric pressure for this purpose what to provide increase in effort of braking, it is established on a partition in a motor compartment

Hand brake

The hand brake has a drive on back wheels by means of a cable and the lever located in the central section of salon. The hand brake is a part of a back drum-type brake, the gap between blocks and drums is regulated automatically. On cars with back disk brakes the lever of the hand brake puts in action two blocks located in the central part of a brake disk. The gap between blocks and drums is regulated manually.

System of the prevention of wear of brake shoes

If blocks are worn-out to such an extent that it is necessary to replace them, the red precautionary lamp on the dashboard lights up. If blocks are not replaced, it can lead to disk damage.

On some cars the additional control lamp of wear of blocks which lights up only at the pressed pedal of a brake is established, warning, thus about fast replacement of blocks.

The sensor of wear is attached to brake shoes. The sensor settles down on the left forward wheel, on some models there is one more sensor on the right back wheel. The sensor of wear provides short circuit of contacts at wear of a block to some set limit. Fire of a lamp of wear of blocks means that the disk of a brake erases an insulating cover of the sensor. At replacement of blocks always check the sensor (and). At replacement of blocks after fire of an alarm lamp, it is necessary to replace as well the sensor (and).

Service

On termination of any works with units of brake system always check efficiency of braking of the car. Check of brakes should be carried out on the equal, pure, dry road with low-heavy traffic.

Check of brakes should be carried out on various speeds, by weak and sharp pressing a brake pedal. The car should stop without having changed the movement direction. Do not allow movement yuzy since it leads to reduction of efficiency of braking and decrease in stability of the car.

Efficiency of braking is influenced also by a condition of tires and corners of installation of wheels.