The ball bearing/valve from the reservoir into the master could be rusted closed- Since you have NO brakes at this point I'd use compressed air (low PSI to start) to flush/clean the whole system and start fresh. Leaving everything in place means you won't blow out a piston. I've put air in the master cylinder hole inside the fluid chamber or the brake light sending unit and free-d the resevoir ball.Crack a bleeder (attach a hose to catch fluid in something)and put air into the other end of the brake line is one method. I use a shop vac (any vac with a hose will work)to pull fluid through the lines- can or jar with a lid(clear is best), drill/cut a hole the size of the vac hose,cut/drill a hole the size of tubing(1/4" usually) from bleeder. Vac hose is kept at the lid, hose from bleeder is dropped to the bottom. Elevate the 1/4" hose leaving the bleeder to watch for fluid flow. Fill master, crack bleeder, turn on vac and let it pull fluid into jar/can.
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