Question about 1989 GMC Sierra

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I have a 89 GMC pickup with brake light stuck on..

I used to be able to pull back on the peddle to shut brake light off, but now it stays on so I pull the battery. What would cause this? Any ideas? I thought it was the return spring, but can't find it at all. :/

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  • 2 more comments 
  • MindLegend Jun 30, 2009

    It's really tight in there and it was dark too not to mention my health is turning bad.. I'll try digging in there tomorrow though.. I noticed it slides a little up and down the peddle shaft a bit.

  • MindLegend Jun 30, 2009

    something in there does..could be unrelated, but not sure.. The sun is up so maybe later i can climb under there.. kinda blows to be sick having to reach into hidden places.. oh well :/

  • MindLegend Jun 30, 2009

    Any idea where I can find an exploded view of removing the switch? it's pretty cluttered up in there not to mention dark.

  • MindLegend Jun 30, 2009

    Switch is eliminated.. I pulled it out and disconnected it, but brake lights are still on.. any other ideas?

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  • 21 Answers

The return spring is inside the power booster(what the master cylinder bolts to) but most likely it is the brake light switch the box on the pedal where it coonests to the booster shaft

Posted on Jun 30, 2009

  • 1 more comment 
  • Justin Mcdaniel Jun 30, 2009

    the switch shouldnt slide at all

  • chaosthew484 May 12, 2011

    i removed the brake switch and took it apart and removed the spring inside it and readjusted the switch when i put it back in and it works good now.

  • chaosthew484 May 12, 2011

    its more then likely your brake switch what you do is remove the brake switch i had to remove mine and remove the spring inside it to get it work properly cause my brake lights wouldnt shut off.

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