What happens if you mix DOT 3 and DOT 4 brake fluid?

What happens if you mix DOT 3 and DOT 4 brake fluid?

Yes, DOT 3 brake fluid is compatible with DOT 4 brake fluid. However, DOT 4 offers a higher boiling point. … It's compatible with DOT 3 and DOT 4 fluid. DOT 5 brake fluid is silicone, meaning it doesn't absorb water.

Which is better dot3 or dot4?

Boiling Points The basic difference between DOT3 and DOT4 is the boiling point. … Both DOT3 and DOT4 are hygroscopic, meaning they absorb water. Due to its lower boiling point, DOT3 is more prone to water absorption.

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Can you mix DOT 3 and DOT 5 brake fluid?

It is important never to mistake DOT 5.1 (glycol-based) with DOT 5 which is silicone-based and should never be mixed with any other DOT fluid. … By mixing DOT 3, 4 and 5.1 brake fluids, assuming it is fresh fluid, the worst thing that can happen is a drop in the boiling point of the whole fluid.