04 went to 160K pulling a trailer before the brakes needed to be changed...
We've found a few things that need to be addressed.....
1 - always check the boots and behind the boots between the piston and caliper... if you have one brake wearing more than the others its most likely dirt behind the pads... we've seen these boots loose, and damaged from heat...
2 - always when you go and push the piston back into the caliper, open the bleeder, and push the dirty brake fluid onto the ground... in fact as you take the system apart, open the bleeder than to see of any of them are frozen... and how you will address this later...
3 - some abnormal wear of from the caliper not floating on the mounts, clean with a wire brush... . both the caliper and the mounts and put some lube on them when they go back together... .
4 - We use an inexpensive premium pad, on our light duty applications and use performance friction, carbon metalic on our heavy duty applications...
Hope this helps... .