Just had a brake inspection on 2005 Tahoe Z71 with 70k miles. Front worn only 15% and rear 40%, the opposite of what I would have expected. I am the original owner and the Brakes have never been replaced. It's like the front calipers are not working, or is this normal for a 2005 Tahoe? I had to replace the pads every 15k on my last Tahoe. Anyone know anything that could cause the front brakes to not be wearing down (or perhaps not working)? Vehicle has always stopped well, but did have some front grabbing about 20k miles ago. Dealer found nothing wrong back then.