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E30 series BMW 3

since 1983-1994 of release

Repair and car operation



E30 BMW
+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engine
+ 4. Cooling system
+ 5. Heating and ventilation
+ 6. Fuel system
+ 7. Exhaust system
+ 8. Transmissions
+ 9. Coupling
- 10. Brake system
   10.2. Specifications
   10.3. Anti-blocking system (ABS)
   10.4. Blocks of disk brakes
   10.5. Support of a disk brake
   10.6. Brake disk
   10.7. Blocks of drum-type brakes
   10.8. Main cylinder of brakes
   10.9. Vacuum amplifier of brakes
   10.10. Cable (ы) hand brake
   10.11. Adjustment of the hand brake
   10.12. Mechanism of the hand brake
   10.13. Brake pedal
   10.14. Switch of a signal of braking
   10.15. Hoses and lines of a hydraulic actuator of brakes
   10.16. Air removal from a hydraulic actuator of brakes
+ 11. Running gear
+ 12. Body
+ 13. Electric equipment
+ 14. Good advice



10.7. Blocks of drum-type brakes

GENERAL INFORMATION

Prevention

Blocks should be replaced at the same time on both wheels. At replacement of blocks it is necessary to replace also springs and elastic temperature regulators. Because of cyclic thermal loads of springs the last gradually lose the elastic properties and blocks start to touch a drum that results in their accelerated wear.


Device of a back drum-type brake

1. Cap of a viewing opening
2. Brake board
3. Block
4. Slip
5. The top pulling together spring
6, 17. A bolt with an internal 6-faced head
7. Drum
8. Temperature regulator spring
9. The bottom pulling together spring
10. A level of a regulator of a gap between blocks and drums
11. Spring of automatic adjustment
12. Lever of automatic adjustment
13. Wheel cylinder
14. Cup of a clamping spring of a block
15. The union for air removal
16. Cap
18. Axis of a clamping spring

The most admissible diameter of a drum

If blocks do not change, take measures to that. that them not to mix. Each block should be established on a former place.

If the wheel cylinder leaks or is damaged, replace it after removal of brake shoes, having disconnected a tube of a hydraulic actuator and having unscrewed bolts. The cylinder is not subject to repair, though in the spare part to it are delivered ремкомплекты.

PERFORMANCE ORDER
1. Block forward wheels, release bolts of fastening of back wheels. Lift a back part of the car and establish on supports. Remove back wheels and release the hand brake.
2. Unscrew screws of fastening and remove a drum.
3. If the drum does not give in to removal, dig getting liquid between a disk and a nave and some minutes later remove a drum.
4. If the drum still does not give in to removal (on a drum the development fillet was formed), reduce blocks having turned a thin screw-driver a regulator cogwheel.
5. Check on a drum existence of cracks, задиров, deep scratches and a vykrashivaniye. If defects are not eliminated with polishing by an emery paper, a drum перешлифуйте.
Prevention

Drum repolishing at each dismantling and check of a condition of a brake is recommended. Drum repolishing is not allowed if its internal diameter becomes more than the most admissible (it is specified on a drum).


6. Disconnect the bottom returnable spring at first from a forward block, then from back, and remove a spring.
7. Disconnect the top returnable spring at first from a forward block, then from back, and remove a spring.
8. Remove a clamping spring of a forward block, then a clamping spring of a back block.
9. Remove a forward block with the lever of a regulator and a spring. It is necessary to put these details at assembly on a new block.
10. Remove a regulator assembled. Wipe a regulator and be convinced that the wheel is scrolled freely. Every time at installation of blocks is recommended to replace a thermospring (a spring bracket near a regulator wheel). Rotating the wheel expose a regulator in the situation corresponding to completely reduced blocks.
11. Disconnect a cable of the hand brake from the lever of a drive and remove a back block
12. Installation is carried out upside-down taking into account the following.
13. Put high-temperature greasing on rubbing sites of a board of a brake. Do not allow greasing hit on rubbing surfaces of brake shoes or a drum.
14. Be convinced that grooves of a regulator came into the corresponding grooves on the lever of a drive of blocks.
15. At installation of a regulator of blocks, at first establish the lever on a block.
16. Then attach the bottom end of a spring to the lever, and the top end to the corresponding opening in a forward block.
17. Upon termination of this stage of assembly the brake assembled should look as is shown in a picture. Now it is possible to start assembly of other brake.
18. Upon termination of establish brake drums.
19. If changed wheel the cylinder, pump over brakes (see subsection 10.16).
20. Press several times a brake pedal that worked a regulator, thus from drums clicks should be listened.
21. Adjust the parking brake.
22. Establish wheels and wrap bolts. Lower the car and tighten bolts with the set moment. Check work of brakes before departure.