One problem related to brake disc rotor has been reported for the 1998 Chevrolet C/k Pickups. The most recently reported issues are listed below.
Front rotor on Chevrolet cheyenne 4 wheel drive pick-up separated into two parts. The inner section being the part where the lugs are. The outer section being the portion the brake pads ride on. Inspection of the rotors shows an insufficent thickness in the metal of the rotor. This is not an isolated incident. A friend of mine had the same thing happen to him. I replaced the rotors with new ones, but I was fortunate that I heard a noise at a toll booth as I pulled onto a high speed highway. I have the defective part.