The brake light switch is the top switch mounted to the top of the
Brake Pedal. Begin by disconnecting the wires leading to the switch, then loosen the locknut located on the pedal side of the switch and unscrew the switch from the retaining bracket. Installation follows the reverse of the removal procedure, and once installed, adjust the switch-to-pedal clearance. Confirm that brake pedal free play is within specifications by using a feeler gauge inserted between the pedal stopper and the threaded end of the brake light switch. Turn the brake light switch adjusting nut until the distance between the switch and stopper meets the specified measurement, then tighten the adjusting nut. Adjust the Automatic Speed Control Device (ASCO) switch in the same manner as the brake light switch. Finally, press the brake pedal to ensure that the brake lights illuminate when depressed and turn off when released.