Servotronic (E38 Only): Notes
The servotronic steering system is based on a conventional power assisted steering system. An additional electro-hydraulic solenoid and oil passageways are added to the conventional worn and roller type steering box. The GM monitors the vehicle's road speed and regulates an electro-hydraulic solenoid. The servotronic steering system provides the following:
- A light steering effort at low speeds and while parking.
- Increased steering effort as road speed increases.
The "Direct Hydraulic Reaction" provided by the system allows the frictional forces between the front wheels and road surface to be transmitted to the driver. This allows the driver to make a better judgment in regard to the driving conditions.
This principle of direct hydraulic reaction can be used with the servotronic system because of the spool valves that are already used with the worm and roller steering box.