Bel-Ray Super DOT 4 Brake Fluid exceeds FMVSS Sec. 571.116 DOT 4 motor vehicle brake fluid, SAE J1704 and ISO 4925 specifications. Mixes with all fluids meeting DOT 3 or DOT 4 specifications. For use in all drum or disc brake systems and hydraulic clutches, except systems using mineral-based fluids (LHM).