RAM 1500 Van V8-5.2L VIN Y (1999)
Brake Warning Indicator: Description and Operation
General Information
The red brake warning lamp is connected to the parking brake switch and to the pressure differential warning switch in the combination valve.
The red light illuminates for approximately 2-4 seconds at engine start up. This is a self test feature designed to check bulb operation.
The red warning lamp illuminates when the parking brake is applied. It also illuminates if a fluid pressure drop occurs in either the front or rear brake
hydraulic circuit. A pressure drop moves the valve in the combination valve toward the low pressure side. When the valve moves it pushes the
pressure differential switch contact plunger upward. This closes the contacts and completes the circuit to the lamp. The lamp will remain on until
repairs are made and normal fluid pressure is restored.