To put your vehicle into a stop, the rotor is grasped by the caliper. Hence this is the main role of the Raybestos Brake Disc Rotors. With such function, it has been designed using the toughest material like iron. Aside from that, this product is also designed with enough heat resistance to last even the toughest brake exerted by the driver. Similar with the other kinds of automotive devices, this product has its wearing out period as well. But mainly, this product gets damaged depending on the frequency of use of the other components like the brake pads. To know if these are already damaged, you should look at the thickness of these components. Brake disc rotors are engineered to have standardized thickness. These have to maintain the ideal thickness that the caliper could handle in order to provide enough friction. Therefore when the rotors already exceeded their minimum thickness, they should be replaced with these Raybestos brake disc rotors for maximum braking performance.