Audi A4

since 1994 release

Manual of the car

Audi A4
- Running gear
   Protection of passengers
   Full zinc covering
   Four-wheel drive
   Concepts of the all-wheel drive
   Distributive torsen-differential
   Dynamics of the movement on the dry road
   Maintenance instructions of the quattro cars
   Mechanism of blocking of differential
   Additional works on maintenance
   Motive compartment
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ System of an exhaust
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and channels of absorption
+ System of injection
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ System of ignition
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics


Mechanism of blocking of differential

If the previous Audi 80 model was still supplied with mechanical blocking of a back axis, then in A4 blocking is carried out by the EDS system. Its advantage consists that blocking affects also forward wheels, but there is a shortcoming which is that the effect of blocking is reached only due to braking of turned wheel that under certain conditions operation is less effective, than at mechanical blocking.

The EDS system is closely connected with system of anti-blocking therefore read technical information on EDS in the section ABS and EDS.