I just got my MH back from the service shop for a brake job. The brake pads were in real bad shape. Although there was a lot of pad left, they were disintegrating and separating from the backing pla...
I would say heat or cheap pads or a little of both. I'm slowly learning it is worth it to buy premium pads. I used to think that cheap pads just meant they wore out quicker. Good pads get better grip, brake smoother, and are more stable under high stress.