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PortuguêsBrake fluids are classified according to a ‘DOT’ number that is the acronym for the ‘Department of Transportation’ in the United States of America.
The Department Of Transportation is a body that joins a variety of North-American offices and governmental agencies with the aim of ‘safeguarding the serity of any public means of transport, increasing mobility, and contributing to the economic growth of the nation by means of transportation’.
The DOT specifications are a measure of the quality of the braking fluid, which are classified according to their boiling point. DOT 4 has a higher boiling point than DOT 3, meaning that it responds better to braking, improving the safety of the driving.
A higher DOT means a higher boiling point, in accordance with the regulation:
| SPECIFICATION | BOILING POINT MINIMUM ºC |
| DOT 3 | 205 |
| DOT 4 | 230 |
| DOT 5.1 | 260 |
| DOT 5 (*) | 260 |
The temperatures shown in this table are understood as the minimum required.
(*): DOT 3, DOT 4, and DOT 5.1 ¬brake fluids are made with a polyethylene glycol base and can be mixed among themselves¬, but not with DOT5, which is made with a silicone base.
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