Dorman M630482 Brake Master Cylinder. Fits what vehicles: 2003-2008 Audi A4, 2003-2008 Audi A4 Quattro, 2004-2008 Audi S4. Brake Master Cylinder. This brake master cylinder is precision-engineered to match the design, function, and performance of the original master cylinder on specific vehicle years, makes and models.
