Replacement of blocks of disk brake mechanisms. BMW the 5th E28/E34 series (from 1981 to 1993 of release)
Repair of BMW E28 and series E34 from 1981 to 1993
1. Cars of the BMW brand of 5-series
2. Engine
3. Cooling system
4. Power supply system
5. Ignition system
6. Control systems of the engine and decrease in toxicity of the fulfilled gases
7. System of production of the fulfilled gases
8. Coupling
9. Manual box of gear shifting (RKPP) and automatic transmission (AT)
10. Transmission line
11. Steering and suspension bracket
12. Brake system
12.1. General information
12.2. General information on anti-blocking brake system
12.3. Replacement of blocks of disk brake mechanisms
12.4. Removal, major maintenance and installation of a support of the disk brake mechanism
12.5. Survey, removal and installation of a brake disk
12.6. Replacement of boots of drums of brake mechanisms
12.7. Removal and installation of the main brake cylinder
12.8. Condition check, removal and installation of the vacuum amplifier of brakes
12.9. Description, removal and installation of the vacuum hydraulic booster of brake system
12.10. Replacement of a cable (cables) of a drive of the parking brake
12.11. Adjustment of the parking brake
12.12. Condition check, removal and installation of assembly of the parking brake
12.13. Adjustment of a pedal of a brake
12.14. Check and adjustment of the switch of a stoplight
12.15. Survey and replacement of brake lines and hoses of hydraulic system of brakes
12.16. Pumping of hydraulic system of brakes
12.17. Diagnostics of malfunctions of brake system
13. Body
14. Control body sizes
15. Heater and air conditioner
16. System of onboard electric equipment
17. Routine maintenance of the car
18. Size table and adjusting data
19. Schematic electric circuits
20. Governing bodies and operation receptions
21. System of onboard diagnostics - a principle of functioning and codes of malfunctions


12.3. Replacement of blocks of disk brake mechanisms

It is necessary to replace disk brake shoes on both wheels at the same time - NEVER replace blocks only on one wheel. Besides, the dust created by brake system, can contain the asbestos harmful to your health. Never delete it by means of the compressed air and do not inhale it. At work with brakes it is necessary to put on a special filtering mask. Never, under no circumstances, use solvents on the basis of gasoline for washing of details of brakes. Use only a cleaner of brake system! At service of disk brakes use only original or high-quality firm brake shoes.

Brake liquid is poisonous. It also strongly dissolves paint. See. The prevention at the beginning of the Section Pumping of hydraulic system of brakes.

The procedure described below belongs both to lobbies, and to back disk brake mechanisms.


  1. Uncover (covers) the tank with brake liquid and merge about two thirds of liquid from the tank. If you do not make it, liquid will be poured from the tank at pressing in of pistons of a support in their openings.
  2. Release bolts of fastening of wheels, поддомкратьте a front or a back of the car and reliably establish it on axial support.
  3. Remove lobbies or back wheels, necessarily. Work with each party of brakes in turn that the collected party if necessary could serve as a sample at assembly.
  4. Attentively survey a brake disk as it is described in the Section Survey, removal and installation of a brake disk. If machining is required, remove a disk as it is described in the same Section, thus it is possible to remove blocks from supports also.
  5. Following descriptions on illustrations below, make procedure of removal of brake shoes.

Here the photos describing procedure for back supports are not provided; differing on the size a little, on a design they are identical to forward brake supports.

Some models can have excellent from shown in this Chapter of number and types of protivovizgovy laying and other details. Before dismantling it is necessary to pay attention to, how details are established in the car further to have possibility correctly to collect them.

  1. Disconnect the electric socket of the sensor of wear of a brake shoe.
  1. Remove caps from bolts of fastening of a brake support and give bolts.
  1. Take a protivovizgovy spring.
  1. Push through the piston With-shaped........
  1. Remove a support and an internal brake shoe.
  1. Remove an internal brake shoe from the piston.
  1. Suspend a support on a piece of a wire that it did not disturb work.
  1. Remove an external brake shoe - to establish new blocks, repeat procedure upside-down.
  1. Do not forget to examine sensors of wear of blocks (only a forward left wheel, or forward left and back right a wheel). If they as it should be, reinstall them from old blocks on the new; if they wore out from a friction, establish new sensors on new blocks.
  2. Installation of new blocks repeats removal procedure upside-down. At installation of a support make sure that all fixing bolts are tightened with demanded effort.
  3. On termination of work strongly squeeze out a brake pedal several times to bring blocks into contact with disks. The pedal should be at normal height from a floor and not sink down. Check level of brake liquid and if necessary add it in the tank. Carefully check, whether there are no leakages of liquid and whether brakes before the beginning of normal operation of the car well work.
  4. Whenever possible avoid sharp braking the first 80-100 km of run while new blocks will not get used to a place.

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12.2. General information on anti-blocking brake system
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12.4. Removal, major maintenance and installation of a support of the disk brake mechanism