Keeping you Ready for the Road Ahead , the Power Products Type 12 Standard Stroke Service Brake Chamber boasts high quality material, not only meeting, but also exceeding OEM requirements. This service brake chamber transforms energy from the compression of air to apply the right amount of force to your semi truck's brakes. The Type 12 Standard Stroke Service Brake Chamber is suitable for use in a wide variety of heavy duty vehicles, including trailers, buses, and trucks. Gain the required high tensile strength and innovation needed for brake safety with this heavy duty service chamber. FleetPride is your First Click in Heavy Duty .