Before I retired I would see that stuff all the time. I was a government fleet tech. I had to trailer a fire ladder one early morning. They shattered all 4 rear brake rotors. Like glass! 93,000# truck on a 35ton trailer. Officer comes in after a high speed chase, and request we check tires, brakes, and it's been making a funny noise for about 1500mi. I barely get the car on the lift, and I hear what sounds like a shotgun come from the rear axle. "Um.... Ya think you could manage getting noises checked out a little sooner, so you don't die!"