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sounds like you have a warped rotor.use the vacuum pump like suggested above and in the sequence above and you should be ok.I would drill out the broken bleeder valve and replace it.it's the only way to get all the air out.
If there are no leaks in the system,the master might be going.
How does the pedal feel,spongy or firm?
If you pump the pedal a few times how does it feel?