Stoplight Switch
WARNING: This page is about a different car, the 2003 BMW Z8 and 2002 BMW Z8. However, it is still accessible from the selected car via links, so may be relevant.
Stoplight switch is at brake pedal arm. To adjust, loosen lock nut and turn adjusting nut until contact plunger touches pedal arm. Adjust length of plunger until about .20-.24" (5-6 mm) is visible. Tighten lock nut.