Problem bleeding new brakes.

Hey guys,

I installed a new master cylinder and new calipers on my 74 Dart. I have manual disc brakes. I was using a hand vacuum pump to bleed the lines at the cailpers and on the passenger side I was able to get fluid out of the bleeder screw however, on the drivers side, I was not able to get any fluid out of the bleeder screw. The car has been sitting for 7 months is it possible that the brake distribution block is no good or blocked?