Ive had my 1988 Starion ESI-R for about a year now and last week the Driver Side rear caliper began hanging up and dragging. I replaced both the rear calipers, still the same issue. I replaced both left rear brake hoses. Still locking up to the point the tire cannot be rotated by hand. I cleaned, inspected and tested the proportioning valve. Same issue. Replaced the master cylinder. Still the same issue. Warrantied out the left rear caliper, same problem as before. The right side seems to rotate on its own just fine. The issue is clearly hydraulic as after you crack the bleeder screw on the hung up side, the wheel will spin freely. My next step tonight is to do an ABS delete. Has anybody else experienced similar issues and WHY IS IT ONLY AFFECTING ONE SIDE????? I have dissaembled and flushed all the hard lines. They flow freely in both directions. Any suggestions??