Circuit Operation

The "BRAKE" indicator receives battery voltage when the ignition switch is in "RUN," "BULB TEST," OR "START." Three switches are connected to the bulb so that when any one closes, the indicator turns "ON". The ignition switch "BULB TEST" position does not have a detent, but the ignition switch closes to ground and turns "ON" the BRAKE indicator before the "START" position is reached.

The master cylinder brake fluid level switch closes to turn "ON" the "BRAKE" indicator and briefly sounds a fast chime when the hydraulic brake fluid reservoir is low. This condition could be caused by a leak in one of the brake lines, calipers or master cylinder. Filling the reservoir to its normal level opens the switch. Make sure the brake system has been repaired before filling the master cylinder reservoir.

The park brake switch closes when the park brake is applied, turning "ON" the BRAKE indicator. Releasing the park brake opens the switch and turns off the BRAKE indicator.