ACDelco Brake Fluid DOT 3 & DOT 4 GMW is a premium brake and hydraulic clutch fluid for systems requiring a FMVSS No. 116 DOT 3 & DOT 4, ISO 4925 Class 6. ACDelco Brake Fluid,DOT 3 & DOT 4 GMW is suitable for all applications requiring a DOT 4 performance level brake fluid and meets GMW 3356. The ACDelco Brake Fluid DOT 3 & DOT 4 GMW protects internal components from corrosion under normal use and service.