Product Details: 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®.