Genuine 4B1 611 931AS Brake Booster Vacuum Hose with Check Valve

The Genuine 4B1 611 931AS is an OEM brake booster vacuum hose assembly designed for Volkswagen and Audi vehicles. This critical brake system component connects the engine intake manifold to the brake booster, providing the vacuum pressure necessary for power-assisted braking operation.

Key Features:

• Includes integrated non-return check valve to maintain vacuum pressure
• Direct OEM replacement part manufactured to Volkswagen Group specifications
• Ensures proper brake booster function and pedal feel
• Durable construction designed to withstand engine heat and vacuum cycling
• Factory-spec fitment for hassle-free installation

This genuine vacuum pipe is engineered specifically for 2001-2005 VW Passat models and 2002-2004 Audi A6/S6 Quattro vehicles. The integrated check valve prevents vacuum loss when the engine is off or under low vacuum conditions, maintaining consistent brake assist performance. OEM part number 4B1 611 931AS replaces damaged or deteriorated original hoses that can cause poor brake pedal response or increased pedal effort.