[Blacdout96]

The disc brakes in the 3rd gens before 1989/1990 were trash especially because of the proportioning valve. Your pistons may have build up on them, preventing them from gliding back smoothly, common on rear caliper pistons with cars that brake fluid is never/rarely bleed from the system. I hate to say it, but I would buy a Centric rebuild kit, and clean/rebuild that calipers to see if that fixes the problem, if not, well you may be on your own. Also Advance brake products are trash, should of at least went with Auto Zone or NAPA.