Audi 80/Avant (B4)

since 1991-1995 release

Repair and operation of the car



Audi 80/Avant
+ Technical specification
+ Engines
+ System of production of the fulfilled gases
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ System of injection
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
- Brake system
   Check of brake mechanisms
   Brake fluid
   Check of level of brake fluid
   Check of tightness of the brake system
   Replacement of brake fluid
   Disk brake mechanisms
   Measurement of thickness of blocks of the disk mechanism
   Control of a condition of brake disks
   Replacement of blocks of disk brake mechanisms
   Drum brake mechanism
   Measurement of brake shoes of the drum mechanism
   Check of the course of a pedal of a brake
   Disk brake mechanism of back wheels
   Measurement of thickness of blocks of back disk brakes
   Check of a free wheeling of the lever of the parking brake
   Main brake cylinder
   Amplifier of brakes
   Check of the amplifier of brakes
   Regulator of brake forces
   Repair of the hydraulic drive of brakes
   Pumping of the brake system
   List of malfunctions
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrical system
+ System of ignition
+ Lighting
+ Signaling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ Body elements
+ Search of malfunctions
+ Specifications





List of malfunctions

Malfunction
Its reason
Than to help
A. The car when braking takes away aside 1. Uneven pressure in tires
2. Uneven profile of tires
3. Brake shoes became covered with dirt, were made oily or unevenly wore out
4. Guides in a support of the disk brake mechanism are covered with dirt or rusted
5. Rusted the piston in a support of the disk brake mechanism or in the wheel brake cylinder
6. Brake shoes incorrectly adjoin to a drum
7. Brake disks have scratches or too thin
8. The deformed brake drums
9. The inflated brake hoses
To modify on cold tires
To replace tires
To replace blocks
To clear

To clear of a rust or to replace


To check, if necessary to establish new brake shoes

To replace brake disks

To process on the lathe or to replace

To replace hoses

B. Brakes creak 1. Blocks are picked incorrectly up
2. Dust and dirt on disk brake mechanisms or in drum brake mechanisms
3. See. And 4, 5, 7 and 8
To establish original blocks
To remove blocks, to remove pollution
C. Brakes knock and are blocked 1. See. And 5
2. The acting rivets of laying
3. See. And 8
4. Too weak returnable springs of brake shoes
5. Beating of a brake disk
To replace

To replace

To replace
To replace

D. One or all wheel brake mechanisms strongly heat up 1. The compensation opening in the main brake cylinder is hammered
2. There is no side play between a brake pedal (a press bar) and the piston of the main brake cylinder
3. The rusted supports of the disk brake mechanism
4. The parking brake is not switched-off completely
5. The returnable spring (the drum brake mechanism) is broken
To clean

To establish


To give to repair

To check cables of the brake drive and brake mechanisms of back wheels
To replace

E. Too big course of a pedal of a brake, a pedal is pressed softly and springs 1. Air in the brake system
2. Leakage in the brake system
3. Faulty main brake cylinder
4. At strong load of the brake system (overheat) formation of vials of steam in too old brake fluid
5. See. And 5
To remove air from the brake system
To carry out an inspection on tightness
To replace
To replace brake fluid
F. Ill effect of brakes at big effort to a pedal 1. Normal course of a pedal: blocks are covered with oil or glazed over
2. Short course of a pedal: the amplifier of the brake drive is faulty
3. Long course of a pedal: one brake contour does not work because of leakage
To replace

To check

To check, replace the damaged details

G. The parking brake operates unilaterally or too poorly 1. See the description under And
2. The rusted cable of the brake drive
3. The adjusting mechanism is faulty
To replace
To check







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