The brake indicator in the instrument cluster alerts the operator of problems in the vehicle's braking system. With the ignition switch in the RUN or the START position, voltage flows to the instrument cluster from CKT 39 (PNK) from GAUGES Fuse 4. The BRAKE indicator lamp is illuminated whenever CKT 33 (TAN/WHT) from the instrument cluster is grounded.

The BRAKE indicator illuminates if you apply the parking brake while the ignition switch is in the RUN or the START position. This alerts the operator to release the parking brake. The parking brake warning switch is mechanically grounded. The switch contacts close when you apply the parking brake, grounding CKT 33 (TAN/WHT) .

The brake pressure differential switch closes the contacts when conditions in the hydraulic brake system are abnormal. This grounds CKT 33 (TAN/WHT) and CKT 680 (PPL) through CKT 150 (BLK) to ground.

The electronic brake control module also grounds CKT 33 (TAN/WHT) if there are abnormal conditions in the antilock brake system (ABS). The BRAKE indicator lamp and the antilock brakes warning indicator lamp both light for ABS failures.

Refer to ABS Description and ABS Operation in Antilock Brake System for further information about ABS operation.