Posts Tagged: DOT 3 versus DOT 4

Brake Fluid — Differences between DOT 3 versus DOT 4

Learn the differences between DOT 3 versus DOT 4 brake fluid Brake fluids DOT 3 and DOT 4 are made with glycol-ether, 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. But there are ingredient and operational differences between DOT 3 versus DOT 4 fluids. • DOT 3 fluid is approximately 80% glycol ether base. • DOT 4 is made with 50 to 65% glycol ether base with 20-30 % … Read More