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Posts Tagged: Brake Fluid DOT4

Brake Fluid DOT4

What is Brake Fluid DOT4 Brake fluid labeled as Department of Transportation DOT 4 is made with 50 to 65% glycol ether base with 20-30 % Borate Ester to resist boiling.  The boiling point of dry DOT 4 is 450°F and 311°F when wet. Those are higher boiling points than DOT 3, but DOT 4 absorbs water about 20% faster than DOT 3 fluid. Are brake fluids interchangeable? DOT 4 fluid can be used in a vehicle where DOT 3 is specified, but DOT 3 should never be used on … Read More


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