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320 air brakes

	Hello.  I'm hoping someone on the list can help me with a
perplexing problem.  I recently purchased a '77 320i to fix up for a
friend.  It sat for a year in an impound lot here in Ohio, but was driven
most of its 160 K in CA and FL.  It had no brake pedal pressure when I got
it, and several attempts at foot bleeding and pressure bleeding were useless.
I put in a new master cyl, ran a couple more quarts of fluid through it
with the same result.  A little bit of pedal that won't pump up.  There
are no leaks and it loses no fluid.  The original fluid wasn't
particularly dirty, but sometimes even under pressure from the power
bleeder, no fluid or air comes out, esp in the rear; and sometimes the
stream of fluid from the rear bleeders deteriorates from a strong clear
stream to a dribble, as if something is blocking the line.  It feels like
there is a big bubble of air somewhere that just won't budge.  Could the
proportioning valve or power booster somehow cause something like this? 
I've bled a lot of hydraulic systems but have never run across something so
stubborn.  Am I missing something or should I call a priest?  TIA, Ron.