Renovate your engine with essential parts with Expertise Built In to provide enhanced brake safety, with the OTR 3030 Type Standard Stroke Spring Combination Spring Brake Chamber. This replacement brake chamber applies the spring brakes once the internal air pressure falls below a certain level, acting as an additional safety measure for suspended loads. Manufactured with a solid metal body to efficiently contain pressure and the energized spring brakes. FleetPride is your First Click in Heavy Duty .