Audi A4, S4

since 2000 release

Repair and operation of the car


Audi A4, S4
+ Introduction
+ Governing bodies and methods of safe operation
+ Current leaving and service
+ Engine
+ Cooling systems, heating and air conditioner
+ Power supply systems, release and decrease in toxicity of the fulfilled gases
+ Systems of electric equipment of the engine
+ Manual box of gear shifting
+ Automatic transmission
- Coupling, power shafts and differential
   + Coupling
   + Power shafts of wheels
   - Models with the full drive of wheels
      General information
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment





Models with the full drive of wheels

General information


Full drive. Quattro models

1 — the Engine
2 — Coupling
3 — Manual a check point
4 — Primary shaft of a check point
5 — the Shaft of selection of power
6 — the Hollow shaft
7 — Forward differential
8 — Torsen's Differential
9 — the Driveshaft
10 — the Back shaft of selection of power
11 — Back differential

I \1st transfer
II \2nd transfer
III \3rd transfer
IV \4th transfer
V \5th transfer
R — the Backing
A1 — the Main transfer forward
A2 — a reverse Main gear
T — the speedometer Drive

The AUDI A4 quattro car has the constant full drive. Are in addition applied to the drive of back wheels: driveshaft, differential of a back axis, two power shafts of back wheels, and also interaxal differential of Torsen.

The driveshaft transfers a torque from a check point of a forward axis to differential of a back axis. From differential of a back axis two power shafts transfer the movement to back wheels. For compensation of various turns of wheels and distribution of a torque between forward and back axes, depending on traffic conditions, on models with the full drive the self-locking interaxal differential of Torsen which can transfer a variable torque on lobbies and back wheels is in addition established.

Features of towage

Models with the full drive can be towed with the lifted lobbies or back wheels.

Thus, however, the car cannot be towed on distance more than 50 km and the speed of towage should not exceed 50 km/h. The car has to be towed on the special conveyor.

With the full drive the engine at towage should not work for cars. The general instructions on towage are provided in Poddomkrachivaniye's section and towage.