Brake problems on 92 silverado

[WS6]

Thanks Paul. We tried backing the rear shoes off a little and that made no difference. We are completely lost at this point. The truck drives fine and steers fine, but with normal braking pressure it bounces from 45 down to 35 mph that's it. The truck does nothing else odd or wrong. Hammer the brakes and the truck stops perfectly fine with no bounce. I dunno