brake troubles.

I have a 77 gmc k20 and i blew a brakeline and lost fluid in the resouvour. i put on a new brake line and flex hose on the front driver side wheel. i then put new calipers on both fronts. i went to go bleed the brakes and i got fluid on the passenger side front but none on the driver side front and my pedal goes all the way to the floor and it is not driveable, im starting to think it is the master cylinder, any suggestions?