Necessary preliminary tasks

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Remove front UNDERBODY PROTECTION
Have a cleaning cloth ready to catch escaping oil

Detach plug (1) from hydraulic valve (2).

Fig 1: Identifying Hydraulic Valve And Plug

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1) and remove hydraulic valve (2).

Fig 2: Identifying Hydraulic Valve Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Replace O-ring (1).

Fig 3: Identifying O-Ring

Courtesy of BMW OF NORTH AMERICA, INC.