Equip your semi to be Ready for the Road Ahead , with the Haldex GoldSeal+ 3036 Long Stroke Combo Spring Brake Chamber, a crucial element that provides enhanced brake safety. Due to its pressurized inner chamber, this replacement component is able to apply the spring brakes as a safety measure once the internal air pressure drops below a certain level. Constructed with a rugged metal body to efficiently contain pressure and the energized spring brakes. FleetPride is your First Click in Heavy Duty .