Hydraulic System Bleeding

Power steering system must be bled whenever system is opened, or oil level falls so low that the vane type pump picks up air. Fill reservoir to upper mark with fluid.
Turn engine over with starter and continue to add fluid. When oil level no longer falls, start and run engine at idle speed.
Turn steering wheel rapidly from lock to lock and back until no further air bubbles rise in reservoir. Stop engine on 733i and operate brake pedal to discharge hydraulic accumulator.
On all models, during and after operation, fluid level must remain at upper mark.