I've never ran across this before and am not sure what happened. I took the rear drums off and the rear brake shoes linings had almost disintegrated. The pads were very thin. I have seen them before and they weren't very worn down then. The drums were scored up but can be turned. The axels got hot enough to turn the silver rally wheel paint brown where the surface of the wheels by the lug nuts were touching the axels. The right was slightly darker. The front hold down springs in the brakes had come loose and the strut bar spring and other springs appeared to have gotten hot enough that they either compressed, stretched or broke. I had taken the Camaro out on the turnpike and had been doing 75 and when I took an exit I heard some metallic noises that didn't sound good. ( A shop had changed the open 12 bolt to a posi a couple of years ago and I thought at first that it had made the noise.) I drove at not over 55 to where I was going to and the noise had quit. I noticed the back trim rings were covered in a light brown dust. Later when I got back home I pulled the drums and was surprised to find what I mentioned. I'm trying to figure out what caused the brake failure. Both wheel cylinders appear to be Delco but I can't imagine they are the originals but the rubber dust boots were gone. Whether they burned off or had rotted off from age I can't tell. So is it possible that the cylinders were starting to leak and caused the linings to get sticky while I was driving and caused the damage? The back brakes have never locked up. Or I had trouble getting the differential clutches to stop chattering and I used synthetic lube and it seemed to have been a lot better but can the gears get hot enough to transfer heat to the wheels and brakes? I appreciate any thoughts.