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The new brake rotor is then fitted with new wheel bearings, which we packed with grease, followed by a new inner seal. After the rotor is installed onto the spindle, we spun the rotor while tightening the spindle nut several times. We then backed off the nut just to the next available slot and installed a new cotter key and grease cap. When the rotor is installed properly, there should be a very small amount of endplay felt when the rotor is pushed and pulled laterally on the vehicle.