hard brake pedal no stopping power on 2003 Oldsmobile Alero

I just replaced front rotors and pads on my 2003 alero now the brake pedal is hard but it has no stopping power.the
brakes will not lock up

Asked by for the 2003 Oldsmobile Alero
This sounds like the brake booster is not working. Make sure it is getting vacuum to the booster and the hose wasn't knocked off.