Jerry,
Thanks for the input. The return line is metal as are the other lines in the system including flexible lines (at the wheels) that had been previously replaced with teflon lined stainless steel, so this would eliminate the collapsing hose theory. Today I isolated/ bypassed the booster and the brakes are responding normally (no seizure), although of course without boost, so I am assuming that the rebuilt booster or its slave are at fault and will return it to the rebuilder under warrantee.
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