Alright here's my theory. Went through this whole brake grabbing thing recently too on my '90 with 300K miles on it. Put on new shoes but didn't have the drums turned. Result, brakes grabbed and basically wouldn't let go even when I had the adjusters totally out. Crap. Had drums turned so that the outer lip was removed, put them back on. Result, brakes still grab, dangit! Got new drums, grabbing gone. Took a look at old drums wondering why a turned drum wouldn't work since it was as smooth and true as the new one. I noticed the inside lip was barely touched when it was turned so there was that slight ridge still there. For shi$* and giggles I took them in and had them re-turned to get rid of that ridge on the inside of the drum. Got home, put them on, sure as shi%*, no grabbing. Moral of story, I think that after enough wear on the drum to form that inner ridge occurs, somehow and eventually, that ridge grabs the shoes and pulls them out and perhaps moisture allows the pads to expand slightly thereby exacerbating the problem. :dunno: