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

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

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