It might not look like it, but a brake rotor is one of the most stressed components on any car or truck. But it is not the plates that are under the most stress, it is where the plates meet the hat of the rotor. If there is any cracking, it can result in a structural failure of the rotor. When inspecting a rotor, it is essential to look for cracks in this area. In this video, Andrew Markel looks at how to inspect rotors for cracks, thickness and runout. This video is sponsored by ADVICS.