- 1). Make sure that there is no set screw holding the rotors on. Some rotors do not use set screws to hold them in place, while others do. The set screw will be located on the face of the rotor and will be either a flathead, Phillips or star-shaped Torx screw. If the rotor refuses to come off, check for set screws and remove them if needed.
- 2). Spray penetrating lubricant between the rotor and the hub. Once you have determined if the rotor has set screws and removed them if it does, the next step is using penetrating lubricant to soften any corrosion that has built up between the rotor and the hub of the vehicle where the rotor mounts. You can use WD-40 or a more powerful lubricant that is formulated specifically for use on frozen bolts and parts. Let the lubricant sit for as long as possible (several days to a week if possible) and spray more on periodically.
- 3). Tap the back of the rotor with a rubber mallet to free it. Once you have sprayed on the penetrating lubricant and let it soak in, tap the rotor from the back (away from the car) to free it from the hub. You can use a rubber mallet if you are reusing the rotor and want to avoid damaging it, or you can use a metal hammer if you are going to discard the rotor and are not concerned about scratching or damaging it.
- 4). Apply heat to the rotor where it mounts to the hub. If the penetrating lubricant and the hammer method do not work, applying heat to the area where the rotor and the hub meet may encourage the rotor to come off. Use a propane torch and heat the area behind the rotor if there is enough access. Use caution with this method if you are reusing the rotors, since excessive heat can damage the rotors.
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