I'm only getting about 10,000 miles on a set of severe duty pads on the fronts. The rear pads have about 30k on them and they are almost shot. The fronts wear fairly evenly. It appears that they drag while I drive. Basically its like the calipers are going, but because its evenly on both sides, could the issue be the master cylinder? The rears seem to be wearing sooner than they should, too. I had a person suggest greasing the sliders but it's still the same issue. I suppose the master cylinder isn't that hard of a job to do, I just don't want to throw out several hundred on a truck with 220k on it.