Rebuilt the master cylinder about 20 months ago. Recently the front pads started this horrible squeaking. It seemed that the caliber was not relieving pressure after releasing the brake handle. Ok, remove the caliber, inspect the seal, clean everything, new seal, and heck, since everything else is new, went ahead and ordered a new glass for the master cylinder. Now the system sat for about 3 weeks with no brake fluid as the holidays got in the way of shed time. So I get everything done and reassembled start putting in fluid, but it won't pump it into the lines. Tried with the bleeder open and closed, with the line attached at the handle removed, even removed the pump and spring to verify all the little holes were clear. Still nothing. Let it sit overnight thinking maybe the seals need to be resaturated, but still nothing. Any ideas before I order another rebuild kit?