After thoroughly cleaning the spindle, we re-installed the rotor. The slots in the rotor provide much-needed airflow to both cool and clean the rotor. Beware when installing, as the rotors are specific to each side. Thankfully SSBC clearly marks them so they're difficult to confuse. As you can see, we re-used the stock backing plate. One nice thing about the SSBC kit is that it utilizes all of the stock components.