[Vehicle Fitment]: Compatible with Audi A6 2003, S6 2007; (with ATE Master Cylinder): Compatible with Audi A4 2003-2009, A4 Quattro 2009, A4 Quattro 2003-2008, A6 2004, A6 Quattro 2002-2004, S6 2002-2003 --- It comes without Master Cylinder. [Reference Number]: The A-Premium vacuum power brake booster's reference number: 53-3110, 533110, 3B0612107D, 8E0612107B, 8E0612107F. [Superior Quality]: Power Brake Booster are coated with anti-rust coating, which can effectively prolong the lifespan. Premium craftsmanship and materials ensure superior quality and durability, and excellent performance enhances the whole braking system..
