What’s the Difference Between DOT 3 and DOT 4 Brake Fluid?

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Brake rotor glowing red due to heat.

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Brake rotor glowing red due to heat.

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The primary difference between the two is their respective boiling points. I suspect I know your next question. But first, some background. The U.S. Department of Transportation classifies brake fluid into four main categories: DOT 3 DOT 4 DOT 5 DOT 5.1 Their primary differences are their wet & dry boiling points and their composition.

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