Get your semi Ready for the Road Ahead with enhanced brake safety, with the MGM Brakes 3030 Long Stroke Spring Brake Chamber. Thanks to its pressurized 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. Crafted with a rugged metal body to efficiently contain pressure and the energized spring brakes. FleetPride is your First Click in Heavy Duty .