This power brake booster check valve is designed to match the fit and function of the original valve on specified vehicles, and is engineered for durability and reliable performance. This part is compatible with the following vehicles. Before purchasing, enter your vehicle trim in the garage tool to confirm fitment. [Audi A4 Quattro: 1999, 2000, 2001, 2002, 2003, 2004, 2005] - [Audi A4: 1999, 2000, 2001, 2002, 2003, 2004, 2005] - [Volkswagen Passat: 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005]