Genuine OEM BMW brake booster vacuum line, part number 11667550919. This hose is responsible for transferring vacuum pressure from the engine source to the brake booster unit. It is a critical component for maintaining consistent brake pedal feel and power-assist functionality. The line features factory-molded bends and quick-connect fittings for precise routing within the engine bay. Genuine OEM vacuum lines are engineered with specific material compounds to resist heat, oil, and vacuum collapse, ensuring long-term braking system reliability.