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  1. #1
    Jr. Mechanic TMRuiz's Avatar
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    Dec 2008
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    Gonzales, Louisiana
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    147

    Post Fyi - Third break light assembly water leak

    To all 2007 and later Silverado and Sierra owners. I just had to bring my truck into the dealer due to the third break light assembly leaking water into the cab. It ruined the headliner and the had to pull all the interior out of it to dry up all the water. Just want people to keep a look out for this. I didn't notice it till my area got hit with some pretty heavy rain. Dealership says it doesn't happen often but they have had a couple of trucks brought in for it. The rain collects right above the the back window by the support post. I'm just letting fellow GM owners know to keep an eye out for this just in case.

  2. #2
    Jr. Mechanic jmonte3's Avatar
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    Jul 2008
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    Lafayette, La
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    Default

    man thats unlucky, thanks for the tip i'll keep an eye out

    Jmonte3
    07 Sierra NBS Black Crew Cab 5.3L Z71
    15% tint
    Gmc pin stripes
    Blacked out GMC Logos
    Dual Flowmaster exhaust
    Kicker Stereo System w/ Pioneer Avic-D3 Navi/Dvd
    Volant CIA
    Edge Evolution
    Poweraid TBS
    Leveling Kit
    Changed Door Handles to match shiney black paint

  3. #3
    Legend tlperry68's Avatar
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    Oct 2008
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    Huntington Beach, CA
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    Default

    Thanks for the heads up, I'll watch for it.
    Trevor - Huntington Beach, CA
    2007 GMC 2500 4X4

  4. #4
    Legend
    TRPLXL2's Avatar
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    Default

    Wow I have never heard of that happening, now I'm going to be paranoid about my tan headliner! Thanks for the helpful tip, and I hope I don't ever have that problem!
    2004 Chevy Colorado
    LS1 5.7 swap/TBSS rear axle swap

  5. #5

    Default

    Is your truck Reg, Ext or Crew cab?

    2008 Silverado 1500 Crew cab, Silver birch metallic . 4.8ltr Leer topper

  6. #6

    Default

    i had the same thing happen to my 03 silverado, didnt see it until i had my amp under the back seat and it got and started cutting out i just took the third brake light out and siliconed all around it fixed the problem

  7. #7

    Default

    Same with my '03. Noticed it when I went through the car wash last night.
    Current Daily Driver:
    2003 Chevrolet Silverado 1500 - 4WD - 4.8L V8 - True Dual Exhaust Setup, Cat Delete, Cherry Bomb Glass Packs

  8. #8

    Default I'll look..

    Thanks for the info... Better keep an eye on mine..

  9. #9
    Jr. Mechanic TMRuiz's Avatar
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    Dec 2008
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    Gonzales, Louisiana
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    147

    Default leaking third break light

    Quote Originally Posted by road rash View Post
    Is your truck Reg, Ext or Crew cab?
    It's a Quad cab just like yours.
    [/SIGPIC]07 Silverado LS factory 20's, spray in bedliner, in-bed cargo managment system, matching tint on front windows, K&N CAI, and Hypertech Max Engery Tuner and yet even more mods to come.

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