Coach Cleats,
First off, before there's any thought about costs involved in replacing your brakes, do one of two things.
1. Get under there and either use a mirror or get your head up behind the front wheels and do a close up inspection of your shoes, both shoes, both sides.
2. If you think you're not capable of a quality inspection, have it done.
A couple of questions. Are you the original owner of the coach? If so, what is your driving/braking procedure on grades, coasting, off ramps etc.? If you're not the original owner, at what mileage did you take it over? And again, what's the driving/braking technique?
And, has there been regular maintenance on the coach, lubing it, etc.?
I ask all this because, it helps determine what kind of brake life you SHOULD have left. As has been stated, folks that know and understand how to use auxiliary braking, i.e. exhaust brakes, compression (Jake) brakes etc. will seriously extend your service life of your regular brakes.
We are presently at 81,000 miles on our '04 Itasca Horizon 36G with the C-7 330HP CAT and, it presently has at least 85% of the original brake shoes left. I most certainly expect to double that mileage before I'm needing new shoes.
Scott