BMW 3 series E30

Since 1983-1994 of release

Repair and car operation

10.1. Introduction

THE GENERAL DATA

The scheme of two-planimetric brakes (the variant with disk forward and back brakes is shown) and a drive of a manual brake

1. Cables of a manual brake 2. A support of a back brake 3. A disk of a back brake 4. A tube of a highway of a hydrodrive 5. A pedal 6. The main cylinder of brakes

7. A support of a forward brake 8. A disk of a forward brake 9. A nutritious tank of brakes and a coupling hydrodrive 10. The vacuum amplifier 11. The lever of a manual brake

The device of a forward brake

1. A bolt 2. The union for air removal 3, 17. A support axis 4, 7. A cover 5. The piston 6. A cover 8. The gauge of deterioration brake колодок 9. Колодка

10. The screw of fastening of a disk 11. A continuous disk 12. A ventilated disk 13, 14, 18. A bolt 15. A support arm 16. A cylinder sealant 19. A support

All cars are completed by forward disk brakes and also back disk or drum-type brakes. On all cars forward and back brakes are self-regulated. On some cars of late release the antiblocking 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.

The 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

Manual brake

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

System of the prevention of deterioration brake колодок

If Pads are worn out to such degree that it is necessary to replace them, the red precautionary lamp on the panel of devices lights up. If Pads will not be replaced, it can lead to disk damage.

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

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

Service

On termination of what or works with units of brake system always check efficiency of braking of the car. Check of brakes should be carried out on equal, pure, dry road with малоинтенсивным movement.

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 a movement direction. Do not suppose movement юзом, 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 tyres and corners of installation of wheels.