Toyota
Dodge Durango
 Service Manual
Brakes » Base brake system » Diagnosis and testing
Combination valve

Pressure Differential Switch

(1) Have helper sit in drivers seat to apply brake pedal and observe red brake warning light.

(2) Raise vehicle on hoist.

(3) Connect bleed hose to a rear wheel cylinder and immerse hose end in container partially filled with brake fluid.

(4) Have helper press and hold brake pedal to floor and observe warning light.

(a) If warning light illuminates, switch is operating correctly.

(b) If light fails to illuminate, check circuit fuse, bulb, and wiring. The parking brake switch can be used to aid in identifying whether or not the brake light bulb and fuse is functional. Repair or replace parts as necessary and test differential pressure switch operation again.

(5) If warning light still does not illuminate, switch is faulty. Replace combination valve assembly, bleed brake system and verify proper switch and valve operation.

    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

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