Audi A4, S4
Controls and receptions of safe operation
Current leaving and service
The engine
Systems of cooling, heating and the air conditioner
Power supply systems, release and decrease in toxicity of the fulfilled gases
Systems of an electric equipment of the engine
Manual box of a gear change
Automatic transmission
- Coupling, power shafts and differential
    Power shafts of wheels
   - Models with a full drive of wheels
      The general data
Brake system
Suspension bracket and steering
Onboard electric equipment

Models with a full drive of wheels

The general data

Full drive. Models Quattro

1 — the Engine
2 — Coupling
3 — Manual a check point
4 — the Primary shaft of a check point
5 — the Shaft of selection of capacity
6 — the Hollow shaft
7 — Forward differential
8 — Differentsial Torsena
9 — Kardannyj a shaft
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 a lobby
A2 — The Main transfer back
T — a speedometer Drive

Car AUDI A4 quattro has a constant full drive. To a drive of back wheels are in addition applied: карданный a shaft, differential of the back axis, two power shafts of back wheels, and also interaxal differential of Torsena.

The kardannyj shaft transfers a twisting moment 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 indemnification of various turns of wheels and twisting moment distribution between forward and back axes, depending on traffic conditions, on models with a full drive the self-blocked interaxal differential of Torsena which can transfer a variable twisting moment to forward and back wheels is in addition established.

Features of towage

Models with a full drive can be towed with the lifted forward 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/hour. 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 resulted in section of Poddomkrachivanie and towage.