[bcj67chevy]

hey guys,
Just got a 1972 chevy 4x4 w/ power brakes and front disc. Truck doesn't stop well at all. The pedal is rock hard from the beginning and doesn't seem to go down very far. Would this be the booster and or master cylinder, or could it just be air in the brake lines? Had the front wheels off and the brakes look good.
Hopefully one of you guys ran into this before.

Thanks
Bryan