There are several types of brake fluid available on the market, including DOT 3, DOT 4, DOT 5, and DOT 5.1. Each type has different characteristics and is suitable for specific vehicles and ...

DOT 3 and DOT 4 are glycol ether based. You can mix DOT 4 with DOT 3 brake fluid, but never add DOT 3 to DOT 4. DOT 5 brake fluid is silicon based and incompatible with any other DOT brake fluid.