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Did work on left rear brake - self adjuster not working well.  Decided to bleed both rears [farthest first].  Have a suction bleeder.  No matter how much I pump out [keeping master full], there are still bubbles.  Don't know why.  Suggestions?  

[The master has always remained full which would seem to eliminate air getting in/brake fluid out].  

Answer my own question:  Air coming in around bleeder valve/plug when loosened.  Took out plug, messy, put in rubber plug to reduce fluid flow while I put Teflon tape on plug threads.  Installed, no air.