Diagnostics of malfunctions of brake system. 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
 








12-17-diagnostika-neispravnostejj-tormoznojj-sistemy.html

12.17. Diagnostics of malfunctions of brake system

Before coming to conclusion about refusal of brake system check a condition and pressure of a rating of tires and uniformity of loading of the car (see. Head Routine maintenance of the car). Besides, check correctness of corners of installation of wheels (see. Head Steering).


Symptom Possible reason
When braking course stability of the car is broken Tires (are pumped incorrectly up see. Head Routine maintenance of the car).
Adjustment of corners of installation of wheels (is broken see. Head Steering).
On one axis tires of a various standard size are established.
Passableness of brake lines or hoses (is broken see. Head Brake system).
The support of the brake mechanism (is damaged see. Head Brake system).
Weakened fastening of components of a suspension bracket (see. Head Forward suspension bracket).
Weakened fastening of a support of the brake mechanism (see. Head Brake system).
During braking there are extraneous noise (a gnash or high-frequency squeal) Frictional overlays of brake shoes of lobbies or back brake mechanisms are worn-out to substrate metal. Squeal is published by indicators of wear of blocks at a friction about brake disks. Immediately replace blocks (see. Head Brake system).
Brake vibration takes place. (pedal pulsations)

On the models equipped with ABS of a pulsation of a pedal of a brake are a consequence of normal functioning of system

Excessive cross-section palpation of a brake disk (takes place see. Head Brake system).
Parallelism of walls of a brake disk (is broken above an admissible limit see. Head Brake system).
Non-uniform wear of brake shoes owing to support jamming as a result of the wrong installation of a gap or dirt hit (takes place see. Head Brake system).
The brake disk (is faulty see. Head Brake system).
The course of a brake pedal is excessively great Partial violation of functioning of brake system (takes place see. Head Brake system).
Level of brake liquid fell in GTTs (see. Heads Routine maintenance of the car and Brake system).
Air got to hydraulic system (see. Heads Routine maintenance of the car and Brake system).
For a stop of the car applying of excessively big effort to a brake pedal is required The block of the vacuum amplifier of brakes (is faulty see. Head Brake system).
Partial violation of functioning of brake system (takes place see. Head Brake system).
Brake blocks/boots (are excessively worn-out see. Head Brake system).
The piston (and) a support (is jammed see. Head Brake system).
Frictional overlays of brake shoes (are greasy see. Head Brake system).
New brake shoes are established and were not earned extra yet - for extra earnings of blocks to disks time is required.
Brakes "are taken" There is no due return of GTTs pistons (see. Head Brake system).
Passableness of brake lines/hoses (is broken see. Heads Routine maintenance of the car and Brake system).
Adjustment of the parking brake (is broken see. Head Brake system).
Functioning of the mechanism of automatic adjustment of drum-type back brake mechanisms (is broken at the corresponding complete set) (see. Head Brake system).
Uniformity of distribution of brake effort is broken The vacuum amplifier of brakes (is faulty see. Head Brake system).
The mechanism of a pedal of a foot brake (is jammed see. Head Brake system).
Softness of a course of a brake pedal takes place at its squeezing Air got to hydraulic system (see. Head Brake system).
Weakened bolts of fastening of GTTs (see. Head Brake system).
GTTs (is faulty see. Head Brake system).
The brake pedal fails to a floor practically without resistance Excessively liquid level fell in the GTTs tank owing to leaks via the piston (and) supports, weakening of fastening or damage of hydraulic brake lines (see. Head Brake system).
The parking brake does not provide reliable fixing of the car Adjustment of the parking brake (is broken see. Head Brake system).
Are worn-out, or frictional overlays of boots of the mechanism of the parking brake (are polluted see. Head Brake system).


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12.16. Pumping of hydraulic system of brakes
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13. Body