What is the difference between brake fluid T3 and T4?

1 Answers
Omar
07/30/25 12:10am
Brake fluid T3 and T4 refer to the standards set by the U.S. Department of Transportation, namely DOT3 and DOT4. The differences between brake fluid T3 and T4 are as follows: 1. Different boiling points: The equilibrium reflux boiling point of DOT3 is 205°C, while that of DOT4 is 230°C. 2. Different main ingredients: The main ingredient of DOT3 is glycol ether compounds, while DOT4 primarily consists of polyglycol/borate/ester. 3. Different water absorption properties: DOT3 absorbs water very easily, whereas DOT4 absorbs water readily. 4. Different application ranges: DOT3 is suitable for speeds of 90-140 km/h, while DOT4 is suitable for speeds of 140-180 km/h.
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