Rear Brake broken

Was doing a my first lap of the day at my buddies track, and went to use my rear brake, no pressure completely dead.

I took the master cylinder off and apart, cleaned it and re-assembled. When I fill the reservoir and just attach the hose, and hand pump. I can't get anything to come out the hose. Just a tiny bit of air. Seems like I can't get any fluid from the reservoir to the caliper.

So I assembled it all on the bike again, filled the reservoir. Pump the brake pedal, open bleeder, bit of liquid. Then nothing, the reservoir doesn't seem to empty...

If I leave the cover off the reservoir and pump, then open bleeder. I should be able to get that liquid out the bleeder without the cover on right?

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