Ensure your semi truck is Ready for the Road Ahead™ with reactive air brakes, with the Power Products 8" Type 30 Air Brake Diaphragm. With a simple design, this replacement component is able to expand enough to move the push rod, which in turn activates the air brakes. Manufactured with a 10-ounce nylon reinforcing material that is resistant to wear, tear, and environmental factors. FleetPride is your First Click in Heavy Duty®.