Genuine OEM Audi Brake Vacuum Pipe, part number 8W0611931BD. This pre-formed pipe is a critical component of the braking system, responsible for transferring vacuum pressure to the brake booster. This vacuum assistance significantly reduces the effort required to apply the brakes. It is precisely routed within the engine bay, connecting to the brake booster and vacuum source. Weighing approximately 0.037 kg, its specific shape and material are engineered for durability and leak-free operation. Using a genuine OEM pipe ensures correct routing, secure connections, and resistance to engine heat and vibrations, which is vital for consistent and reliable braking performance.