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

Drum brake mechanism

On the front-wheel Audi 80 models which are let out till October of 92 g (which are not equipped with ABS) on the back bridge there are drum 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 brake mechanism used 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 the brake drum in certain limits spontaneously that reduces effort to pedals. In Audi 80 (at advance) the front brake shoe works spontaneously. 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 brake mechanism

Drum brake mechanisms should not be adjusted. Assumed this task, in distinguishing from disk brake mechanisms, adjusting mechanics. With the increasing wear of a frictional covering rods of cylinders between brake shoes move forward in order that blocks again could nestle on a drum. It is provided with a wedge with the spring drive which in process of wear of blocks puts forward rods.