You hit the nail on the head.I recently had a simular problem on my`Burb.I paid for new brakes(incl.rotors & calipers),I know,I was busy

.They didn`t get the spindle nuts tight on one side and that alone was causing drag and heat.I noticed alot of brake dust built up in a short while a few months after the brake job.Usually it`s undetectable.That,and the brakes kept squeeling.I ended up tearing the whole thing down and re-servicing the hole assembly.The rotor got lumpy and the caliper had been cooking,so it was sticking,too.I needed to replace those again,WTF?