On Apr 30, 4:04 pm, mholst...@gmail.com wrote:

I don't think the prop valve could be your problem, as that would
generally cause issues with the *rear* brakes - the fronts generally
run unproportioned straight from the master cylinder.

Have you ever replaced the brake hoses on this car?  My first guesses
would either be simply old front hoses that are acting as check
valves, or else improper master cylinder pushrod adjustment (do you
have enough freeplay in the brake pedal?)

Also, are you sure that it is the front brakes?  if they are dragging
badly, you should be able to feel the wheels and find them to be quite
warm.  If it is actually the rears that are dragging, there are other
things to check,. like parking brake adjustment.

Finally, if you are sure that the front brakes are the problem, if you
have the ability, next time the brakes start dragging, immediately
jack the whole front of the car up and try to spin the wheels.  I'm
assuming that you will find that they are in fact dragging.  then
crack a bleeder screw on one wheel,  If both free up your problem is
not at the caliper or hose, but in the master cylinder, pedal free
play, etc.  If only one frees up then the problem is likely either the
hoses or else bad reman calipers.  If they don't free up at all it's a
mechanical problem with the caliper or something in that area.

good luck

nate