FMVSS 116A DOT 3 AND DOT 4, SAE J1703, ISO 4925JIS K2233 DOT4 BRAKE FLUID IS ONE OF YOUR CAR''S MOST ESSENTIAL COMPONENTS. IT HAS TO RESIST THE MOISTURE THAT CAN CAUSE VAPOR LOCK BRAKE FAILURE, PROTECT AGAINST CORROSION, AND WITHSTAND HIGH BRAKE TEMPERATURES. CASTROL DOT 4 BRAKE FLUID IS LIQUID ENGINEERED TO MAINTAIN BRAKING FUCNTION