It's going to the shop for a thorough going over on Monday, so we'll see what they say about the rest of the braking system. This will be my third brake job in 40K miles, but one was a frozen caliper that cooked the right front, so I suppose that doesn't really count. The truck is only used when it's fully loaded, so very low miles and a lot of sitting. Since the last incident I've been trying to drive it once a week rather than letting it sit for months over the winter to keep things from seizing up. I seldom go over about 58 mph and try really hard not to over-use the brakes. Am I wrong in my understanding that the "tow/haul" mode invokes an exhaust brake?