Is DOT 3 the same as DOT 4?

Asked by Moses Griffith

The primary differences between the two include the following: DOT 3 brake fluid will absorb less water than DOT 4 from the air over time, meaning you’ll need to have your fluid changed less frequently. DOT 4 brake fluid has higher dry and wet boiling points, making it safer for higher temperatures.

Arthur Nash, BA Contributor
Arthur Nash
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