I posted awhile ago about my intermittent dragging brakes on my 1988 740 turbo sw. Some of you may remember the little squabble that erupted about me being a troll, perhaps because of my phraseology; I don't really remember. So now all is forgiven and I have FINALLY found a competent mechanic who was willing to drive my baby around awhile, until the brakes began to drag. Both front calipers frozen YAY, a diagnosis! BUT, if this $400. repair doesn't fix the problem. I'm looking at replacing the master cylinder, which is a lot more $$. They say they can't tell if it's the mc until those calipers are replaced.
So, my question is, how does a master cylinder work, and what else might have caused both of these calipers to fail? And so intermittently! It's taken me almost a year to get the convergence of good mechanic looking at car WHEN the brakes were acting up.
Any explanations or feedback welcome; just don't call me that "T" word again!