Checking fluid level

Check fluid level with engine switched off at expansion tank of power steering/ride-height control system. The fluid temperature should be approx. 20 °C here.

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

If necessary, add hydraulic fluid (refer to OPERATING FLUIDS - STEERING ) up to Max. marking (1).

IMPORTANT: If the fluid level has dropped to the Min. marking (2). you must check the power steering and ride-height control for leaks and issue a separate invoice for this work.
It is not enough merely to top up the fluid.

Fig 1: Identifying Fluid Level Marks

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: To avoid mix-ups when filling with hydraulic fluid, mark the fluid reservoirs or their caps with identification marks.
ATF Automatic transmission fluid
CHF Pentosin CHF 11S

Fig 2: Identifying Fluid Reservoir Caps

Courtesy of BMW OF NORTH AMERICA, INC.