If they are disc brakes then the most important thing for longevity is to use special grease on the caliper slides. Failure to do this will result in the pads not fully releasing and then the pads will start wearing or totally locking up and smoking. The books all say you should do this every year. I use a very good synthetic grease just for calipers and I do it every two years. The other thing for anyone that has hydraulic brakes or air over hydraulics is to flush the brake fluid at least once every two years or the pistons in the calipers will rust of you get a master cylinder failure because of the crud that builds up from moisture. I replaced by pads at 85,000 miles. They still had wear left on them but I had everything apart because of something else so I did it at that time.
"Gunner" USN Retired, Airdale
2004 Monaco Signature 44' Conquest. Detroit 60