Product Details: Get your semi Ready for the Road Ahead™ with enhanced brake safety, with the Haldex 3030 Long Stroke Combo 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. Engineered with a durable metal body to efficiently contain pressure and the energized spring brakes. FleetPride is your First Click in Heavy Duty®.