Product Details: The Haldex Spring Brake Chamber comprehensively converts energy from compressed air to apply the right amount of powerful force to your semi-truck's brakes. This heavy duty spring brake chamber replacement is manufactured with high-quality parts to meet and exceed OEM standards. It uses standard power spring technology for unparalleled force output consistency and its heavy duty housing is designed to withstand impact and extreme conditions. FleetPride is your First Click in Heavy Duty®.