Wearing rear brakes on Denali!!!

[Willyc]

Hello a buddy of mine has a 2004 denali 3/4ton with 4 wheel disc brakes. Anyway he bought the truck new and at 80K It needed rear brakes. So went ahead and had the rotors surfaced and did the brake job. I thought if the rears were this bad then the front would be pretty close also because this was the first time the wheels had been off. Well to my surprise they looked brand new! So I went ahead and flushed and bled the entire system thinking there mat be air in the fronts, but I found nothing wrong.

So now at 90k It needed rear brakes again! All four pads are worn equally to the wear indicators. The fronts also still look great.

So are there any ideas? I went ahead and put some of those green pads from summit in the back and from this time.

Brakes feel normal and he doesnt tow anything.

thanks, will