The brake light switch is usually located on the right side of the brake pedal's top bracket. To check it, note if the brake lights come on when the pedal is depressed and go off when released. To adjust, loosen the locknut, then screw the switch in or out to provide 0.012 to 0.039-inch (0.3 to 1.0 mm) clearance, with no pressure on the plunger and tighten the locknut. To replace, unplug the connector and loosen the locknut. Unscrew the switch, then install the new one and adjust. To reinstall, switch the removal steps going from the last step to the first step.