Removing wheel electronics
WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2008 BMW 335xi, 2008 BMW 335i, 2008 BMW 328xi, 2008 BMW 328i, and 2008 BMW 323i. However, it is still accessible from the selected car via links, so may be relevant.
Release Torx socket crew (1) and remove wheel electronics (2).
Release union nut with special tool 00 2 190; if necessary, grip valve insert (1) at cylindrical section of ball head.
Remove valve insert from rim.
Remove washer (1).