Calibration for vacuum pressure measurement
WARNING: This page is about a different car, the 2010 BMW X6, 2009 BMW X6, and 2008 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.
Seal stop cock (2) in direction of arrow.
Release lock nut on controller (1).
Carry out pressure adjustment in accordance with BMW diagnosis instruction.
Secure controller (1) hand-tight against turning.
Open stop cock (2) again.