DOT 5 Brake fluid: Comes in Purple shades ... Take it to an auto mechanic to replace your brake fluid if the strip's color falls in the “required service” category. My brake fluid read ...

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.