Bel-Ray Silicone DOT 5 Brake Fluid exceeds FMVSS Sec. 571.116 DOT 5 silicone base motor vehicle brake fluid specifications. Mixes with all fluids meeting such specifications. DOT 5 brake fluid may not be mixed with DOT 3 and DOT 4. DOT 5 may be used if a complete system flush is done. For use in all drum or disc hydraulic brake systems, except systems using mineral-based fluids (LHM).