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Braking fluid properties (brake fluid)

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  1. Basic features: power transmission
  2. Important properties: high compressive strength and high boiling point
  3. Brake fluid is very sensitive to moisture.
  4. Humidity increases compression and reduces boiling temperature.

Classify brake fluid according to DOT standard

Grade DOT 2 DOT 3 DOT 4 DOT 5 DOT 5.1
Dry Boiling point (oC) 190 205 230 260 260
Wet boiling point (oC)
(with 3.7 vol% water)		 140 140 155 180 180

DOT 2 is Castor oil/alcohol based

DOT 3, 4 and 5.1 is glycol-ether based, they are hygroscopic.

DOT 5 is silicone based. Special application cars (Hummer, Harley-Davidson)