I have a friend who was pulling a horse trailer in his 93 GMT400 half ton 4x4. One of the rear brake pads had some of the "asbestos"(I think) strip break away from the metal part of the brake pad shoe and get wedged in place. It locked that one rear wheel up and the vehicle and trailer jack-knifed and did some damage. I have seen it as well on my 1995 4x4 rear drums. Easy fix. New pads. I'm glad your are going to have a look.
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