Question about 1999 GMC Sierra

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Brake lights not working

The relay on the pedal keeps moving and the lights wont stay on

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It most likely is a switch, not a relay. It sounds like the mounting bracket is broken, but it could just be loose. Tighten it, replace the part, or fabricate a new holder.

Posted on Nov 25, 2008


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Posted on Jan 02, 2017


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there is a button on your brake pedal lever that while braking gets depressed, and turns on your brake lights. Now this component is a plastic piece that can get knocked loose rather simply. You either need to re-secure this component, or replace it

(you can get this part at any junk yard for nothing more than some pocket change)

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