Outfit your semi to be Ready for the Road Ahead with enhanced freeze protection of the air brake system, with the Penray Air Brake Antifreeze. With a specialized formula, this replacement antifreeze prevents the compressed air in the air brake system from freezing, while protecting the valves, lines, and chambers from ice damage. Manufactured with a multipurpose mixture to use with both standard gasoline and diesel vehicles. FleetPride is your First Click in Heavy Duty .