Brake fluids are often forgotten but are possibly the most essential fluid in a vehicle from the safety aspect. They need checking and changing regularly to avoid brake fade and loss of efficiency. The performance of a brake fluid is generally denoted by reference to a DOT specification. Vehicle manufacturers specify the minimum performance requirements of suitable fluids by reference to this DOT spec. Commonly available products are DOT 3, DOT 4, Universal (covering the requirements of both DOT 3 and DOT 4) and DOT 5, although Racing Brake Fluids are available for competition use. Unlike most Racing Brake Fluids PRO RACE BRAKE FLUID is suitable for road use.