DOT Minimum Boiling Point Standard Data Brake Oil Type (Alcohol Base) Dry Boiling Point DOT 3 205°C
Dot4 230 c dot5. 1 ~ 270 c wet boiling point DOT3 140 C
Dot 4 1 55cdot5.1~190c test standard Note:1,the dry boiling point refers to the boiling point of the brake system just after it is added from a sealed container; 2. Wet boiling point refers to the boiling point with water content of 3.5% after two years of use.
Suggested conditions for changing brake oil: Absolute standard: it must be changed when the boiling point reaches180 C-Lucas provides a brake fluid boiling point tester, article number YWB 2 1 1. General standard: the maintenance materials of general automobile manufacturers are recommended to be replaced once every two years, unless you conduct boiling point test. Otherwise, it is difficult to say the absolute replacement time. For example, if the wheel is submerged and the brake cylinder is completely submerged, even if the brake system is well sealed, the water content of brand-new alcohol-based brake oil will exceed 3% after 7 days and reach 7% after 35 days! Therefore, in addition to the replacement standards of automobile manufacturers, it depends on your use environment. If the brake oil is used for 1 year and hits a flooded car, I think it is necessary to change the brake oil immediately for safety reasons.
DOT5. 1 can significantly increase the replacement cycle. Generally, the average replacement period can be about 5 years. Because the borate of MTG used is basically the same as that of DOT4, it is compatible with DOT4. (Personally, it is more appropriate to call it Super DOT4. And DOT5 are completely different materials, which are easily confused), and are currently mainly used in racing cars and military vehicles.