Update your semi with enhanced brake safety, with the MGM Brakes 3030 Long Stroke Combo Spring Brake Chamber that ensures you're Ready for the Road Ahead. To add an extra level of safety, this replacement brake chamber applies the spring brakes once the internal air pressure falls below a certain point. Fashioned with a durable metal body to efficiently contain pressure and the energized spring brakes. FleetPride is your First Click in Heavy Duty.