BMW 3 series E30

Since 1983-1994 of release

Repair and car operation

10.8. The main cylinder of brakes

THE GENERAL DATA

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The prevention

It is recommended to replace the removed cylinder new or restored as in a case подтекания replacement of details of the old cylinder with new details from ремкомплекта positive result does not give a liquid. As a rule, the old cylinder will be worn strongly out, of what it will be possible to be convinced, having spent considerable time for its dismantling.

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The main cylinder and the vacuum amplifier of brakes

1. A nutritious tank 2. A stopper of a tank with the switch of a control lamp of level 3, 6. A vacuum hose 4. A collar 5. The return valve (on models 325i) 7. A collar 8. The return valve (on all models except 325i) 9. Скоба 10. A pusher plug 11. An axis 12. A nut

13. A cover 14. A washer 15. Гаситель pulsations 16. A pusher 17. The filter 18. A sealing ring 19. A restrictive bolt 20. The main cylinder 21. Nuts of fastening of the main cylinder 22. Уплотнители a tank 23. A collar 24. The vacuum amplifier of brakes 25. A knee

Removal

The main cylinder with the attached vacuum amplifier take places in the left part of a motor compartment.

PERFORMANCE ORDER

1. To remove the main cylinder, disconnect a conducting socket (the marksman from above), disconnect hydrodrive tubes (the bottom right arrow) and turn away two bolts of fastening (the bottom left arrow). 2. Remove as much as possible a brake liquid from a tank. 3. Turn on the union of tubes of a hydrodrive on the main cylinder, immediately muffle tubes and apertures. Take tubes aside. 4. Disconnect from the main cylinder sockets, turn away a nut of fastening of the cylinder to the vacuum amplifier and remove the cylinder. Remove and replace a sealing ring (1).

Removal of air from the main cylinder

PERFORMANCE ORDER

1. Before installation of the new or restored cylinder it is necessary for pumping over on the special machine tool. For this purpose fix the cylinder in a vice through a soft lining (otherwise the cylinder can burst!). 2. Establish заглушки with a carving in apertures of unions of tubes of a hydrodrive and slightly tighten them that through them did not take place air. 3. Fill a tank with a brake liquid of recommended type. 4. Remove one of заглушек and enter the piston into the cylinder, having pushed its screw-driver to remove air. 5. Without releasing the piston, tighten заглушку. 6. Repeat procedure until then while the brake liquid will not start to follow from an aperture under the union without air bubbles. Constantly add a brake liquid in a tank of the main cylinder. 7. To accelerate procedure of preliminary prorolling of the cylinder it is possible to muffle an aperture under the union a finger, however upon termination of procedure tighten заглушку and repeat procedure on other aperture.

Installation

PERFORMANCE ORDER

1. Establish the main cylinder (together with a new sealing ring) and wrap by hand fastening nuts. 2. Turn the union of tubes of a hydrodrive, without applying considerable efforts. 3. Tighten all the union and a nut of fastening with the set moment. 4. Fill the main cylinder with a liquid, then pump over it (if preliminary prorolling was not carried out), pump over all hydrodrive. 5. At cylinder prorolling on the car ask the assistant to press some times a pedal and to keep it in the pressed position. Release the union to allow to leave to air and a liquid, then tighten. Repeat procedure for both unions until then while in a brake liquid air vials will not disappear. Check up work of brakes before car operation.