Audi A4, S4

since 2000 of release

Repair and car operation



Audi A4, S4
+ Introduction
+ Governing bodies and receptions of safe operation
+ Current leaving and service
+ Engine
+ Systems of cooling, 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 a full drive of wheels
      General information
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment


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Models with a 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 capacity
6 — the Hollow shaft
7 — Forward differential
8 — Torsen's Differential
9 — the Driveshaft
10 — the Back shaft of selection of capacity
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 — the Main transfer back
T — a speedometer Drive

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

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 movement to back wheels. For compensation of various turns of wheels and torque distribution between forward and back axes, depending on traffic conditions, on models with a full drive Torsen's being self-blocked interaxal differential which can transfer a variable torque on lobbies and back wheels is in addition established.

Features of towage

Models with a 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 speed of towage should not exceed 50 km/h. To be towed the car should on the special conveyor.

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