Product Details: Prepare your semi to be Ready for the Road Ahead™, with the Haldex GoldSeal+ 3030 Standard Stroke Combo Spring Brake Chamber that provides enhanced brake safety. By utilizing a pressure-based chamber, this replacement component is able to apply the spring brakes as a safety measure once the internal air pressure falls below a certain level. Created with a solid metal body to efficiently contain pressure and the energized spring brakes. FleetPride is your First Click in Heavy Duty®.