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 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 brake system
   List of malfunctions
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrical system
+ System of ignition
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications

Brake system

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

Independent repair of brake system

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

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

Principle of work of brakes

If you press a brake pedal, the rod connected with a pedal presses two pistons located one by one in the main brake cylinder (located in a motor compartment).
Pistons squeeze out the brake fluid which is there. Pressure arising thus is transferred in brake system on pipelines to wheel cylinders.
In them pistons press brake shoes to brake disks.
On back wheels of the Audi 80 cars released till October, 1992, the 66 kW, not equipped with system ABS, brake shoes nestle on the brake drum. Other versions, and also the 66 kW version equipped with system of ABS are behind supplied, as well as in front, disk brake mechanisms.
Pressure of liquid appears in two systems of pipelines (contours of the brake drive) independent from each other, namely for one forward wheel and the back wheel located opposite to it (diagonal division of brake system with the double-circuit drive).
If one contour of brake system fails, one forward wheel and a back wheel on other party of the car can be still slowed down. With not braking forward wheel still it is possible to operate the car, but not braking back wheel keeps back part of the car in a track.
The parking brake affects back wheels by means of the hummock drive – not very well, whether drum or disk brake mechanisms are installed there.
In older front-wheel Audi models with 4-or the 5-cylinder engine it was possible to acquire anti-blocking system (ABS) for additional payment. Since January, 1993 ABS enters serial equipment; all-wheel drive models and versions with the 6-cylinder engine were serially equipped with ABS from the very beginning. In more detail you learn about ABS in the following chapter.

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