BMW e30 Brake Fluid reservoir Cap +Sensor GENUINE new with warning switch e30 Brake Fluid Reservoir Cap with Warning Switch Brand NEW part with full 1 year warranty. part# 34 32 1 156 029, fits a narrow range, please check below. 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.