Toyota
Dodge Durango
 Service Manual
Brakes » Base brake system » Diagnosis and testing
Red brake warning lamp

The red warning lamp is in circuit with the parking brake switch and pressure differential switch in the combination valve.

The red lamp illuminates when the parking brakes are applied, or when a pressure drop occurs in the front or rear brake hydraulic circuit.

The lamp illuminates for approximately 2-4 seconds at every engine start up. This is a self test feature designed to check bulb and circuit operation.

A pressure drop in the front or rear brake hydraulic circuit activates the pressure differential valve inside the combination valve. A pressure decrease moves the valve toward the low pressure side. As the valve moves, it pushes the pressure differential switch contact plunger upward. This closes the switch internal contacts and completes the circuit to the red warning lamp. The lamp will remain on until repairs are made and normal fluid pressure restored.

    More about «Diagnosis and testing»:

    Base brake system

    Brake lamp switch

    Red brake warning lamp

    Master cylinder/power booster

    Combination valve

    Disc brake rotor

    Brake drum

    Brake line and hoses

    Brake fluid contamination

    Dodge Durango Service Manual / Brakes / Base brake system / Diagnosis and testing / Red brake warning lamp

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