The characteristics of Dot 3 brake fluids and Dot 4 Brake Fluids are same except, that our heavy duty Dot 4 brake fluid is an automotive break fluid and is used extensively because of its efficient performance. Some of the distinguished features of Dot 4 brake fluid are :About Dot 4 Brake Fluid :-Excellent performanceSyntheticContains antioxidantsHeavy duty break fluidsEliminates problem of vapor lockLow pour point characteristicsCorrosion inhibitorEnsures long service lifeHigh boiling pointSpecifications : DOT-4 Density @ 15c 1.070 Viscosity cst @ 100c 1.5 Dry ERBP min c 230 Wet ERBP c 155 Flash Point PMCC, C 120