It pays to put your hand on your wheels after driving, unless you are real heavy on the brake. The way I drive, my wheels never get more than luke warm to the touch. Put your hand right over the lug nuts. If a caliper is sticking, your wheels will be warmer and possibly hot. Recently I observed a shimmy and actual brake lining odor (most people should recognize this from tractor trailers on the highway) - and also a hot wheel. I got to it quickly enough - my pads and rotor were fine but the caliper had to be replaced. On our old 850's sticking calipers seem to be fairly common...