This Dorman Vacuum Pump Pulley keeps you Ready for the Road Ahead , successfully aiding in the creation of a vacuum in the vehicle’s air brake system. Successfully restore the vacuum pump back to its original condition. This vacuum pump pulley is built specifically for serpentine belts with smooth pulley grooves. Dorman has a distinguished reputation in the heavy duty truck and trailer aftermarket, manufacturing a variety of parts for a complete repair. Through advanced engineering, Dorman successfully checks into today’s most common failures to figure out the why, ultimately delivering modern solutions that not only match OEM parts, but solve known issues. FleetPride is your First Click in Heavy Duty .