Survey, removal and installation of a brake disk. 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
 








12-5-osmotr-snyatie-i-ustanovka-tormoznogo-diska.html

12.5. Survey, removal and installation of a brake disk

This procedure belongs both to forward, and to back to brake disks. Brake disks always should be replaced or repaired in pairs (both lobbies or both back disks), even in case one of them is damaged only.

Survey

 PERFORMANCE ORDER

  1. Release bolts of fastening of wheels, поддомкратьте the car and reliably establish it on axial support. Remove a wheel and get three bolts to hold a disk on a place. If you work with a back brake disk, release the parking brake.
  1. Remove a brake support as it is described in the Section Removal, major maintenance and installation of a support of the disk brake mechanism. To disconnect a brake hose there is no need. Having removed a support, suspend it on a piece of a wire aside that it did not disturb work. Remove a basic bracket of a support.
  1. Survey a disk surface on existence of scratches, cracks and other damages. Slight scratches and superficial flutes are admissible and usually do not influence work of brakes, but deep scratches demand removal and disk replacement, or if it is possible, the pro-point which has been carried out by the expert in a repair truck. In the presence of cracks the disk should be replaced. Do not forget to examine both parties of a disk.
  1. If in operating time of brakes strong vibrations were noticed, existence of deformation of a disk (excessive palpation) is possible. If the car is equipped with ABS system, do not mix the vibration caused by deformation of a disk, with normal work of ABS. At work of this system usually there is a small vibration in a brake pedal.
  1. To measure disk palpation, establish the tsiferblatny indicator in a point located approximately in 13 mm from external edge of a disk. Establish the indicator in zero situation and rotate a disk. Indications of the indicator should not exceed the limit established in the Size table and adjusting data at the end of the Management.
  1. If all of them exceed the established value (and if palpation does not occur owing to wear of the wheel bearing), it is necessary to replace a disk, or if it is possible to pierce in a repair truck.

It is recommended to pierce disks irrespective of indicator indications to achieve a smooth, flat surface that, in turn, will help to avoid vibrations of a pedal of a brake and other undesirable symptoms connected with work of disks. In case all of you decided not to pierce disks, remove at least luster from their surface by means of a skin or an emery paper, using roundabouts.

  1. It is very important to track, that after a pro-point the thickness of a disk did not become less limiting value specified in the Size table and adjusting data at the end of the Management. Minimum admissible thickness of a disk is beaten out on a disk nave. It is possible to measure thickness of a disk by a micrometer.

Removal

 PERFORMANCE ORDER

  1. Give the screw of fastening of a disk...

... also remove a disk from a nave.

  1. If the disk "became attached" to a nave, inject plentiful amount of oil into area between a nave and a disk and leave for some minutes to soften a rust between two components.
  1. If the back disk nevertheless does not separate, insert a thin flat screw-driver through an opening of a flange of a nave, turn an asterisk on the adjusting screw of the parking brake and compress boots of the parking brake.

If the forward disk "became attached", on some disks there is a possibility to insert two-three bolts in special openings and to tighten them. Turn bolts in turn on pair of turns for once while the disk will not be released.

Installation

 PERFORMANCE ORDER

  1. Before installation make sure that a disk absolutely pure. If for removal of a disk oil was used, make sure that on it did not remain its traces. Establish a disk on a nave and get the fixing screw of a disk. Tighten it with demanded effort.
  2. Establish a basic bracket of a support (if it was removed), brake shoes and a support (see. Sections Replacement of blocks of disk brake mechanisms and Removal, major maintenance and installation of a support of the disk brake mechanism). Tighten all fixing details with demanded effort.
  3. Establish a wheel, then lower the car on the earth. Squeeze out a brake pedal several times to bring brake shoes into contact with a disk.
  4. If necessary adjust boots of the parking brake (The section Adjustment of the parking brake).
  5. Carefully check work of brakes before the beginning of normal operation of the car.


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12.4. Removal, major maintenance and installation of a support of the disk brake mechanism
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12.6. Replacement of boots of drums of brake mechanisms