There was sometimes a problem with the park brake cables sticking, but it was usually on 95 to 97 models and the cables were imporved before 98. It is still worth checking.
I have ocassionally seen rear disc brakes wear faster than the fronts. I don't know all of the possible causes for it in someones driving habits. There is one bad habit that I do know will wear rear brakes faster and that is even the slightest proclivity to riding the brakes can cause rear disc brakes to wear faster.
