Audi 80/Avant (B4)

since 1991-1995 of release

Repair and car operation

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
+ injection System
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
- Brake system
   Check of brake mechanisms
   Brake liquid
   Check of level of brake liquid
   Check of tightness of brake system
   Replacement of brake liquid
   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-type brake mechanism
   Measurement of brake shoes of the drum-type mechanism
   Check of a 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 a hydraulic drive of brakes
   Pumping of brake system
   List of malfunctions
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrosystem
+ ignition System
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications

Drum-type brake mechanism

On the front-wheel Audi 80 models which have been let out till October of 92 g (not equipped ABS), on the back bridge there are drum-type brake mechanisms. On this version of the brake mechanism two brake shoes nestle on an internal surface of a drum the piston of the brake cylinder (it is located between the top ends of brake shoes). Thanks to an arrangement of brake shoes in the drum-type brake mechanism applied in Audi 80 (the brake Simplex mechanism – one brake cylinder with two pistons) one of two brake shoes acts in a self-amplifying way. It means that this brake shoe because of rotation of a wheel nestles on a brake drum in certain limits spontaneously that reduces effort to pedals. In Audi 80 (at advance) spontaneously forward brake shoe operates. On a slang of experts it is called as primary block or an active brake shoe. Back is called respectively as a secondary block or a passive brake shoe.

Self-regulating drum-type brake mechanism

Drum-type brake mechanisms should not be regulated. This task assumed, in distinguishing from disk brake mechanisms, adjusting mechanics. With increasing wear of a frictional covering rods of cylinders between brake shoes are put forward, in order that blocks again could nestle on a drum. It is provided with a wedge with a spring drive which in process of wear of blocks puts forward rods.