Bendix 12378 Master Cylinder Designed to match Original Equipment (OE) fit, form and function Aluminum and cast iron housings to mirror Original Equipment (OE) Master cylinders include reservoirs to mirror Original Equipment (OE) and are compatible with J1703/Dot 3 brake fluid Specifications for cylinder assemblies and rubber components based on Society of Automotive Engineers (SAE) and American Society for Testing and Materials (ASTM) standards 100 percent pressure tested after final assembly to ensure leak free operation