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Posts Tagged: DOT 3 versus DOT 4

Brake fluid DOT 3 versus DOT 4

DOT 3 versus DOT 4 brake fluid Brake fluid DOT 3 and DOT 4 are made with glycol-ether and boil lowering additives and anti-corrosive additives. Glycol-ether is used because it has a high boiling point and is compatible with the rubber components used in an automotive braking system. • DOT 3 fluid is approximately 80% glycol ether base. • DOT 4 is made with 50 to 65% glycol ether base with 20-30 % Borate Ester to resist boiling. • DOT 3 boiling point is 401°F dry and 284°F wet. • … Read More


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