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What is the difference in DOT 3 and DOT 4 brake fluid? Which should I use?

April 26, 2017Brake DOT fluid

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What is the difference in DOT 3 and DOT 4 brake fluid? Which should I use?

1 Answer

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A. Use what the manufacturer recommends or a DOT ¾ combination. DOT 4 specs are higher than DOT 3 so this will work in both cases. Some people think that DOT 4 fluid is better that DOT 3 because the boiling point is higher; however it can degrade faster that DOT 3.