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



Brake system

If something has really started moving, the termination of this movement often appears very much a challenge. Only not at Audi 80: thanks to the big brakes on its kinetic energy, naturally, within physical possibilities, it is easily possible «to impose a bridle».

Independent repair of brake system

Behind such important element as the brake system, cannot be too much control! So if you glance from time to time, whether all there at you is perfectly in order, that, means, carry out a problem on car servicing, than the driver simply looking after a certain time interval in a workshop for carrying out of servicing is better. We insistently advise to carry out the careful control especially before a long trip (in holiday), and the more so to owners not absolutely new car.

On the other hand, repair work over brake system demands a responsibility increased feeling. Thanks to our chapter about brakes you can even in house conditions them supervise and repair, including a hydraulic drive of brake system. In similar cases you should solve, whether level of your knowledge for correct performance of these works is sufficient.

Principle of work of brakes

  • If you press a brake pedal the rod connected with a pedal presses two pistons located one after another in the main brake cylinder (located in a motor compartment).
  • Pistons squeeze out a brake liquid being there. Pressure arising thus in brake system is transferred on pipelines to wheel cylinders.
  • In them pistons press brake Pads to brake disks.
  • On back wheels of cars Audi 80 which have been let out till October, 1992, capacity of 66 kw which have been not equipped with system ABS, brake Pads nestle on a brake drum. Other versions, and also the version capacity of 66 kw, equipped with system ABS, behind are supplied, as well as in front, disk brake mechanisms.
  • Pressure of a liquid appears in two systems of pipelines independent from each other (contours of a brake drive), namely for one forward wheel and the back wheel located opposite to it (diagonal division of brake system with a two-planimetric drive).
  • If one contour of brake system fails, one forward wheel and a back wheel on other party of the car can be still braked. With not braking forward wheel still it is possible to operate the car, and not braking back wheel holds a back part of the car in a track.
  • The lay brake operates on back wheels by means of тросового a drive – not very well, whether drum-type or disk brake mechanisms are established there.
  • In older front-wheel models Audi with 4 or the 5-cylinder engine it was possible to get antiblocking system (ABS) for additional payment. Since January, 1993 ABS enters into serial equipment; all-wheel drive models and versions with the 6-cylinder engine have been serially equipped ABS from the very beginning. In more details about ABS you learn in the following chapter.

 The help: if one contour of a brake drive fails, you will need to press much more strongly a pedal (at simultaneously increased course of a pedal) to achieve braking. The brake way also becomes longer.