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Steering system
A modified hydraulic rack and pinion steering system is used in the A4 `05. In particular, the turn-in precision
and the feedback on roll steer effect were optimised compared to the previous model. The steering valve
characteristic was adapted to the new axle kinematics. Turn-in was improved through the use of stiffer track
rods.
For the first time in this class, the "Servotronic" function is standard for all 6-cylinder vehicles and the 2.0-litre
TFSI. "Servotronic" is optional for the other 4-cylinder models with power outputs of 96 kW and higher.
The Servotronic II system familiar from the A6 and A8 is used (for information on mode of operation, see
SSP 285).
Different characteristic curves for steering wheel torque and pressure as a function of vehicle speed are
implemented in the steering system. The systems on the S4 `05 and A4 `05 have different characteristic curves.
The Servotronic solenoid valve is now connected directly to the solenoid valve. The second connector in the
wheel housing was retained for installation reasons.
The steering column was adopted from the previous model, and the steering wheels from the A3 ´04 are used.
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