Actually I should have qualified about the brakes. I changed just the pads at about 40k miles which was regular maintenance. While doing this work, I noticed that the rotors were wearing in a very uneven fashion. The inside of the rotors (closer to the axle) seemed to be wearing down faster and the outter edges of the rotors seemed to be overly rusty. After 20k more miles, the outside of the rotors were starting to crumble away. It was the strangest thing I've ever seen (and I've been doing the brakes on my cars for years). Simply touching the outside of the rotor would make small pieces flake off. I recently changed the rotors on a Mazda for the first time, that car had over 102k miles on it's original rotors. This does not appear to be only an Explorer issue, it must be an issue with whoever is supplying Ford with their rotors. I had a '94 Mustang GT that needed 2 rotor changes in under 70k miles...