Outfit your semi truck to be Ready for the Road Ahead™ with reactive air brakes, with the Power Products 8" Type 30 Long Stroke Air Brake Diaphragm. Thanks to its simple design, this replacement component is able to expand enough to move the push rod, which in turn activates the air brakes. Engineered using state-of-the-art technology for superior performance and reliability. FleetPride is your First Click in Heavy Duty®.