BMW e30 (88-93) Brake Fluid Reservoir Cap + Warn Switch Brake Fluid Reservoir Cap with Warning Switch NOTE: For cars with Lucas Girling brake system. BMW part# 34 32 1 158 520, note the mid-year splits. Genuine BMW part, recently made: not been lying around. PLEASE NOTE the mid-year split on PRODUCTION date. See Models Chart BELOW. Not sure about your car? email us your VIN to confirm.