Bench bleeding master cylinder twice?

We have had next to ZERO luck with parts store power steering pumps or master cylinders and sometimes alternators. Have had to send as many as 3 back before getting a good one
 
UPDATE:

Got it to a local trusted shop.....and the culprit was a completely decimated rear brake shoe, down to the rivets and the pad material was being tossed around in the hub like a hamster wheel.
 
So your wheel cylinder in that drum did not have a stopping point, giving you the mushy pedal feel.

Thanks for updating.
 
Exactly. Definitely a good learning experience. I will add it to my list of things to check before reaching out for help.
 
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