ACDelco DOT 4 GMW Brake and Clutch Fluid is a premium brake and hydraulic clutch fluid for systems requiring a FMVSS No. 116 DOT 4, ISO 4925 Class 6. This product is suitable for all applications requiring a DOT 4 performance level brake fluid. The fluid protects internal components from corrosion under normal use and service. This ACDelco DOT 4 GMW fluid meets GMW3356 and exceeds requirements for a wet and dry equilibrium reflux boiling points (Wet ERBP and Dry ERBP) to help prevent vapor lock resulting from boiling of the brake fluid. It can be used where lower cold temperature viscosities are required and where a DOT 4 brake fluid is required.