"DOT" indicates that the tire complies with the safety standards set by the US Department of Transportation (DOT). "DOT" followed by the next 11 digits and letters that the tire identification number or serial number. DOT is divided into A \ B \ C three, which C-class standard minimum, only to the United States Department of Transportation (DOT) provides the minimum performance conditions. The other two levels are higher than the DOT requirements of the standard.

DOT minimum boiling point standard data brake oil type

(Alcohol) dry boiling point DOT3 205 ° C DOT4 230 ° C DOT5.1 ~ 270 ° C
Wet boiling point DOT3 140 ° C DOT4 155 ° C DOT5.1 ~ 190 ° C
Test standard Note: 1, dry boiling point refers to just from the sealed container to join the brake system after the boiling point;

     2, wet boiling point is 2 years after the use of water content of 3.5% boiling point
Suggested replacement of brake oil conditions:
Absolute Standard: The boiling point must be changed at 180 ° C - LUCAS offers a brake fluid boiling point tester for the YWB 211 brake oil Boiling Point Tester

General standards: General car manufacturers maintenance information are recommended 2 years replacement Unless you carry out the boiling point test, it is difficult to say the absolute replacement time, such as the wheels into the water brake cylinder completely immersed in water, even if the closed brake system, the new Alcohol-based brake oil 7 days after the water will be more than 3%, 35 days after the water up to 7%! So the car manufacturers to replace the standard, but also depends on your use of the environment, if it is a brake oil was used for 1 year encountered flooding car, I would like to for the sake of safety, have to immediately change the brake oil     

DOT5.1 can significantly increase the replacement cycle, the general normal average replacement cycle can be up to 5 years, due to the use of MTG borate and DOT4 basically the same, it can be compatible with DOT4, (personally think that SUPER DOT4 is more appropriate. And DOT5 completely Is two kinds of material, easy to confuse), is currently mainly used for racing, military vehicles.