Brake Warning Indicator: Testing and Inspection

BRAKE/PARK BRAKE INDICATOR

The brake/park brake indicator illuminates when the parking brake is applied with the ignition switch turned to the ON position (Refer to the PARK BRAKE SWITCH TEST table. The same lamp will also illuminate if one of the two (hydraulic or ABS) service brake systems fail when the brake pedal is applied.

PARK BRAKE SWITCH TEST






TO TEST THE SYSTEM:

- As the ignition switch is turned to the START position, the lamp should light.
- Turn ignition switch to the ON position and apply the parking brake. The lamp should light.

IF LAMPS FAILS TO LIGHT, INSPECT FOR:

- A broken or disconnected wire at the switch
- A Defective switch
- A burned out Light Emitting Diode (LED)
- A damaged circuit board

NOTE: The LED's are soldered to, and part of, the Cab Compartment Node (CCN) electronic circuit board. If either the circuit board or any of the LED's are damaged or inoperative the entire CCN must be replaced.

To test the service brake warning system, refer to Brakes, Diagnosis and Testing, Base Brake System Diagnosis Charts, Red Brake Warning Lamp.