Audi 80/Avant (B4)

Since 1991-1995 of release

Repair and car operation



Audi 80/Avant
- The description
   Engines
   Transmissions
   Body
   The chassis
   15-inch wheels
   Brake system
   Seats
   Passive safety
   Full drive
   Distributive Torsen-differential
   Dynamics of movement at a dry road covering
   Instructions on operation for all-wheel drive cars
   Blocking of differential of the back bridge
   Motor compartment
   Regular servicing
   The workplace organisation
   Lubricant works
   The oil expense
   Correct choice of engine oil
   Replacement of engine oil and the oil filter
   Check of level of a working liquid of the amplifier of a wheel
   Check of level of oil of a mechanical transmission
   Check of level of oil in a drive of the back bridge
   The control of level ATF in an automatic transmission
   Check of level of oil in the main transfer of an automatic transmission
   Replacement ATF
   Greasing тросовых drives, hinges and locks
+ 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
+ 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



The chassis

The back bridge

For front-wheel and all-wheel drive models there was a necessity for the new concept of the back bridge in connection with the big luggage compartment and a leaning back back of a back seat. The uniform structure of a body has formed a basis for development as бесdrive, and the leading back bridge in models with a full drive.

For front-wheel models the back bridge with a suspension bracket of wheels on the longitudinal levers connected by a beam and strengthened on a body has been chosen. Such design consists of two rigid on a bend and torsion of longitudinal levers of the tubular section connected among themselves rigid on a bend, but the P-shaped cross-section beam working on torsion. The additional stabilizer is located across the car at an angle to a beam of the bridge and шарнирно is attached to a body. Thereby high cross-section rigidity of the bridge and optimum course stability is reached.

Amortisation racks transfer vertical forces to a body. Springs are located as it is possible more low not to conceal volume of a luggage compartment.

Such constructive decision of the back bridge with a suspension bracket of wheels on the longitudinal levers connected by a beam, strengthened on a body, provides that at joint turn of an axis of levers of both wheels the bridge behaves as the bridge with a suspension bracket of wheels on longitudinal levers, and at beam twisting – as the bridge with a suspension bracket of wheels on diagonal levers.

The back bridge of all-wheel drive models Audi 80 is supplied by directing system of a suspension bracket of wheels with dual cross-section levers.

The directing system of a suspension bracket consists accordingly of two triangular cross-section levers with the additional vertical lever. Shock-absorbers and springs are collected in compact amortisation racks.

Position of the top cross-section levers over wheels helps to place the longitudinal levers located more low in coming out wheel niches that in turn is the precondition for the optimum form of a luggage compartment. The reducer of the back bridge is attached by bolts to a stretcher which, in turn, is attached by bolts to a body by means of pillows.

On front-wheel models Audi 80 there is a so-called back bridge with a suspension bracket of wheels on the longitudinal levers connected by a beam and strengthened on a body. Structurally the bridge consists of two tubular longitudinal levers which are connected by an elastic P-shaped profile.

The forward bridge

Known already forward bridge with a suspension bracket of wheels on amortisation racks was in the changed form is transferred with Audi a compartment, and also from model-predecessor. Additional application of elastic elements from полиуретана does possible convenient проглатывание even the big movement of a body.

The stabilizer of cross-section stability attached to both cross-section levers, considerably reduces a list arising in turn, and also "swallows" the blows received by a suspension bracket at arrival on roughness.

In comparison with the previous model the track of the forward bridge is expanded on 38 mm.

Audi quattro (the all-wheel drive model) has absolutely other design of the back bridge. It is a question of the so-called bridge with dual cross-section levers. On an illustration the drive of back wheels also is visible.