4. The caliper assembly (including disc pads) is carefully stored on the top of the control arm. The rotor is then removed after pulling the dust cap and the cotter pin that holds the spindle nut. The nut is removed with a 11⁄16-inch socket (or wrench) and stored. Note how Mike liberally applied penetrating oil, such as PB Blaster, to the sway bar and control arm to ease disassembly.