2. Each GM line worker has a job to do, and they're held accountable to keep the production line flowing smoothly. Checks and balances are in place to keep quality control high. Here, the new Duralife brake rotors and spindles are mounted to the lower and upper control arms. The new rotors undergo Ferritic Nitro-Carburizing (FNC), a high-temp baking process in a nitrogen-rich environment, which helps prevent rust and corrosion. When we asked Jason Petric, GM Vehicle System Engineer for fullsize trucks, what makes the Duralife brake rotors better than the previous generation brakes, he explained, “The Duralife rotors go through a process that diffuses nitrogen into the braking surface and that offers increased corrosion protection compared to traditional cast iron brake rotors...It's a good value for the customer because the Duralife coating can nearly double the life of the rotor saving both time and money."