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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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89 CHEVROLET 'K' PICKUP BRAKE LIGHT ON DASH STAYS ON WHEN MO

Customer Question

89 CHEVROLET 'K' PICKUP BRAKE LIGHT ON DASH STAYS ON WHEN MOTOR IS RUNNING.BRIGHTNESS DOES NOT CHANGE IF HAND BRAKE IS APPLIED.TIRE SIZE IS WITHIN FACTORY SPECTS .BRAKE PADS & MASTER CYLINDER REPLACED ABOUT 10-15,000 MILES AGO. 380,500 MILES ON TRUCK.
Submitted: 2 years ago.
Category: Chevy
Expert:  Gary replied 2 years ago.
Hi there,
The brake warning lamp is normally activated by the parking brake switch or the low fluid level switch in the master cylinder.
Disconnect the master cylinder fluid switch, start the vehicle, release the handbrake, does light go off now?
Gary