Audi 80/Avant (B4)

Since 1991-1995 of release

Repair and car operation



Audi 80/Avant
+ The description
+ Engines
+ System of release of the fulfilled gases
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and воздухозаборные channels
+ Injection system
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
- Brake system
   Check of brake mechanisms
   Brake liquid
   Check of level of a brake liquid
   Check of tightness of brake system
   Replacement of a brake liquid
   Disk brake mechanisms
   Measurement of a thickness колодок the disk mechanism
   The control of a condition of brake disks
   Replacement колодок disk brake mechanisms
   The drum-type brake mechanism
   Measurement brake колодок the drum-type mechanism
   Check of a course of a pedal of a brake
   The disk brake mechanism of back wheels
   Measurement of a thickness колодок back disk brakes
   Check of a free wheeling of the lever of a lay brake
   The main brake cylinder
   The amplifier of brakes
   Check of the amplifier of brakes
   Regulator of brake forces
   Repair of a hydraulic drive of brakes
   Prorolling of brake system
   The list of malfunctions
+ Antiblocking system of brakes
+ Wheels and tyres
+ Kuzovnaja electrosystem
+ Ignition system
+ Illumination
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ Body elements
+ Search of malfunctions
+ Specifications



Measurement of a thickness колодок back disk brakes

Trosovyj drive of system of a lay brake at the case of a support of the disk brake mechanism of models with disk brakes on back wheels

1 – a tip тросового a drive of a lay brake;
2 – приводной the lever of a support of the brake mechanism of a lay brake;
3 – a returnable spring тросового a drive of a lay brake;

4 – spring скоба;
5 – a cover тросового a drive of a lay brake.


Check of a thickness brake колодок:

6 – a material of a frictional overlay;
7 – the carrier of a frictional overlay.

On back disk brake mechanisms the deterioration control колодок occurs in the same way, as well as on lobbies. Limiting deterioration here again makes 2 mm – without a thickness of a plate-carrier.

Simultaneously with the deterioration control колодок check of a condition of brake disks is spent. Indicators of deterioration and sequence of performance of works same, as well as at check of forward disk brake mechanisms.

Replacement brake колодок back disk brakes

Except колодок, four are necessary самоконтрящихся a bolt which are included, as a rule, into the complete set with колодками. In spite of the fact that work легковыполнима, nevertheless you can face problems if there is no special key 3131 of workshop Audi.

The below-mentioned description, thus, can help only on condition that you can hire this key in a workshop or make it on the sample.

On an illustration a special key 3131 from workshop Audi push back the brake piston of the back disk brake mechanism at the removed support of the brake mechanism.


 PERFORMANCE ORDER

  1. To turn out both fixing bolts of the case of a support of the disk brake mechanism, holding thus directing bolt for шестигранник.
  2. Hand to pull the support case to a car outer side.
  3. Now to cast away it back and to remove.
  4. To take out brake Pads from the directing.
  5. To establish a special key 3131 to the brake piston and to screw the piston strong pressing of a hand.
  6. Ask the assistant to watch thus level of a brake liquid in a tank. If the tank is overflowed, it is necessary to pump out a liquid.
  7. Never push the brake piston without rotation with a great effort. In this case you will destroy the adjusting mechanism in the piston.
  8. To establish new Pads.
  9. To tighten the case of a support of the disk brake mechanism new самоконтрящимися bolts the moment 35 Н•м.
  10. For придерживания a directing bolt to apply only thin рожковый a wrench. Wide can jam, and force of an inhaling in this case will not coincide.
  11. After dismantling of the brake mechanism it is necessary to make necessarily the basic adjustment (the following section see).

Adjustment of disk brakes of back wheels

 PERFORMANCE ORDER

  1. To raise the car behind from both parties and to fix. To remove wheels.
  2. To remove from a lay brake.
  3. To check up, that тросовые drives of system of a lay brake were not under a preliminary inhaling.
  4. For the control to wring out the lever of inclusion of system of a lay brake on a support of the brake mechanism alternately to the right and to the left against the stop.
  5. If the lever of a support of the brake mechanism of other wheel, also moves, means, cables of a drive of a lay brake are tense too strongly. In this case to weaken the central adjusting nut of system of a lay brake, until then while both levers will not reach precisely against the stop.
  6. To put the car on wheels.
  7. At the switched off engine to press a pedal of a brake with average force about 40 times.
  8. Again to raise the car.
  9. To check up, whether wheels can freely rotate.

Removal of a support of back disk brakes

 PERFORMANCE ORDER

  1. To disconnect a brake hose in case it is necessary to replace a support of the brake mechanism.
  2. To remove the case of a support of the brake mechanism as for replacement колодок. Will pay thus attention to the text above!
  3. To remove тросовые drives of system of a lay brake.
  4. To turn out both fixing bolts of the support which is on an axis.
  5. At installation to tighten fixing bolts of a support the moment 65 Н•м.
  6. Spend once again adjustment.

Replacement of cuffs of back brake cylinders

Replacement of defective cuffs of brake pistons by back supports of disk brake mechanisms occurs the same as and on lobbies.

Replacement of a back brake disk

 PERFORMANCE ORDER

  1. To remove a support of the disk brake mechanism.
  2. To remove a brake disk.
  3. To clear a surface прилегания on a nave of a wheel or to smooth out a small skin and to put on a new brake disk.
  4. To spend adjustment under the described scheme.

System of a lay brake

At actuating of the lever of inclusion of system of a lay brake rigid draught under a car floor forward moves. On its end is коромысло – counterbalancing скоба. The cables of a brake drive going back to guards of brake drums or to supports of brake disks are attached To it. Appointment counterbalancing скобы consists in whenever possible in regular intervals to distribute between back wheels force which is enclosed at a tightening of the lever of a lay brake. Fluctuations of factor of a friction of both cables of a brake counterbalances коромысло.

  • At models with back drum-type brake mechanisms drive cables pull for levers of inclusion of system of a lay brake back brake колодок and press them to a drum. Simultaneously the lever of inclusion of system of a lay brake leans through a press bar against a lobby brake колодку. Thereby it also brakes.
  • On models with back disk mechanisms cables of a brake drive operate through приводной the lever, on a press bar and the adjusting mechanism with the way described in section «Disk brake mechanisms of back wheels».