Push down on the brake pedal to make sure the brake lights light up. Be sure to examine the fuse for brake lights and then look at all tail lamps, including the overhead high-mount light, to make sure their bulbs are working correctly. Take out the switch's electrical connector at the brake pedal's top, then look at the connection between switch pins B and C. When you push down on the pedal, you'll want to see energy travel through the wires; when you lift off the pedal again, the wires should become disconnecte To replace the switch, just pull off the electrical wire, loosen the nut on the pedalside, and undo the switch from its holding bracket. Installation is the reverse of removal. To help the brake light switch work right, loosen its locknut and move the switch back until you see a gap appear between the switch plunger and brake pedalmovement. Turn the pushrod locknut loose and move the pushrod until your brake pedal reaches the correct height with the floor, then close the locknut tight. Push the brake switch down until you press the plunger all the way, then release it 1/2-turn counterclockwise, and tighten the locking nut firmly. Afterwards, push the brake pedal with your hand, check that the brake lights turn on when you press it, and turn off when you let go.