Well I finally fixed my dragging brake problem after 6 years, replacing my calipers, pads, flex lines, and master cylinder to no avail. The tip came when I was reassembling after new front pads and tried to bleed my front brakes and no fluid would come out. I took the master cylinder off of the booster and then the fluid started to flow. I put it back on, no fluid flow. I cut a gasket to space it out, no more brake dragging problems.

As far as I can tell, 22 years and 350+ thousand miles has caused the brake booster to shrink a little. This has pushed the plunger too far into the MS upon re-installation. Weird I know, but I have gone through everything else and I can make the problem come and go by removing the spacer. All other wear parts should give in to the spring tension and cause the reverse effect so I don't think it is any other wear. So if you have a seemingly inexplicable brake dragging issue, here's one more thing to check.

Frank.

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'82 300SD