I have an 85 SE V6 that I have converted to 88 rear + brakes.....the last couple of times I have driven it, I have heard a rattle/clicking noise in the right rear...Don't hear it when moving fast- seems to become apparent as I slow from 20 down to 5 mph....I just removed the tire/wheel and it spins good, but the inner half of the caliper is "wet" and covered with small chunks of something.
I suspect the caliper is leaking...but could it be that the bearing is getting ready to.....retire?