BMW 7 Owners & Service Manuals

BMW 7 Series: Bleeding Power Steering Unit

WARNING: DANGER OF POISONING if oil is ingested/absorbed through the skin! RISK OF INJURY if oil comes into contact with eyes and skin!

IMPORTANT: Adhere to the utmost cleanliness. Do not allow any dirt to enter the hydraulic system.

Using contaminated equipment to add fluid may introduce dirt particles into the fluid reservoir and significantly reduce the service life of the hydraulic steering system. Do not use any filler funnels or similar! The fill level may only be checked or adjusted when the engine is stopped! The oil temperature should be approx. 20ºC here.

Ensure that the cap is fully screwed in prior to the fill level check.

NOTE: To avoid mix-ups when filling with hydraulic fluid, mark the fluid reservoir or the cap with an identification mark.

Pump And Oil Supply
Fig. 110: Identifying Hydraulic Fluid Reservoir Cap Identification Mark

1. Thoroughly clean fluid reservoir and its immediate surroundings

2. Check and correct fill level

NOTE: The fill level is dependent on the oil temperature. Check fill level at an oil temperature between 20º and 80ºC. With engine at operating temperature do not exceed "Max. marking 80ºC" (1).

Do not drop below "Min. marking 20ºC" (2).

Hydraulic fluid: see STEERING AND WHEEL ALIGNMENT - OPERATING FLUIDS

Pump And Oil Supply
Fig. 111: Identifying Maximum And Minimum Temperature Marking Of Fluid Level

3. Start engine.

4. Turn steering wheel left and right twice in each case up to full lock; if necessary, top up hydraulic fluid (e.g. if hydraulic system is completely drained).

5. Move steering wheel to straight-ahead position and turn off engine.

6. Check and correct fill level with engine stopped 7. Check hydraulic system for leaks.

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    Notes WARNING: DANGER OF POISONING if oil is ingested/absorbed through the skin! RISK OF INJURY if oil comes into contact with eyes and skin! IMPORTANT: Adhere to the utmost cleanliness. Do not allow any dirt to enter the hydraulic system. Do not draw off hydraulic fluid (risk of contamination).

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