Genuine OEM Audi Brake Servo Vacuum Pipe Hose, part number 8K0611931BH. This critical hose connects the brake servo (booster) to the engine's vacuum source, providing the necessary vacuum assistance for effective braking. It ensures consistent and reliable brake pedal feel. Made from durable, reinforced rubber, it is designed to withstand vacuum pressures and engine bay temperatures. Genuine OEM hoses guarantee precise routing, correct material specifications, and resistance to collapse under vacuum, which are essential for safe and responsive braking performance.