brake master cylinder dakota durango viperBore: 1. 125"; Includes Reservoir 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. It is made of new, high quality materials for a safe, durable replacement. Features & Benefits: 100% new made entirely of new materials, not remanufactured, to ensure highest quality and safety Durable design all rubber components are made of