GM Genuine Parts 20804130 Power Brake Booster Auxiliary Pump Assembly, regular;

The ACDelco GM Original Equipment Power Brake Booster Vacuum Pump uses engine vacuum and atmospheric pressure to increase hydraulic pressure in the master cylinder to provide power assist. This pump is the GM recommended replacement for your vehicle’s original components. These original equipment power brake booster vacuum pumps have been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.