My k5 has a nasty habit of randomly locking up the right rear tire. It doesn't happen over say 25mph thankfully but even at 25 on a wet road you go pretty well sideways and towards the nearest curb. It usually only happens right after the truck has sat for a couple hours and is pretty well cooled down. Backing down my driveway or leaving school goin down a hill it does it. Its worst on rainy days when its easier to lose traction. The thing I don't get is I would think this would be the worst set of brakes on the truck. I mean I have power braked the piss out of it a couple times and well only the right rear spins. I have thought that maybe its down to the rivots in the pad and its just gripping the drum but it started fairly shortly after I did a complete 4 wheel brake job. Adjuster was set just a little past where the drum fit on. brand new drums about 2000 miles ago.