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Kenworth T800 Brake lights

Discussion in 'Kenworth Forum' started by jr33187, Jul 25, 2015.

  1. Jul 25, 2015 #1
    jr33187

    jr33187 Bobtail Member

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    Jul 25, 2015
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    Hi there.........I have a Kenworth T800 and recently my brake light have stayed stuck on. I checked the plunger on the brake and it seems to be going up and down. I noticed if i bleed the air pressure out to almost zero it sends a signal and lights turn off? I dont know what it can be???? Any help or guidance is appreciated.
     
    jr33187, Jul 25, 2015
    jr33187, Jul 25, 2015
    #1
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  3. Jul 25, 2015 #2
    kwswan

    kwswan Road Train Member

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    mcminnville,tn.
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    Brake light switch is sticking on.
     
    kwswan, Jul 25, 2015
    kwswan, Jul 25, 2015
    #2
  4. Jul 25, 2015 #3
    jr33187

    jr33187 Bobtail Member

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    Jul 25, 2015
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    Yes........ turn off when i start to bleed air from system
     
    jr33187, Jul 25, 2015
    jr33187, Jul 25, 2015
    #3
  5. Jul 25, 2015 #4
    kwswan

    kwswan Road Train Member

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    What I mean is that is likely the problem. Behind the dash panel there will be a couple of air swiches & one of these is for the brake lights.
    When the brake lights are on use a test light to find out which one it is & unplug it to see if they go off.
    You could also go to the dealer & find out which one it is & just replace it,they aren't very expensive.
     
    kwswan, Jul 25, 2015
    kwswan, Jul 25, 2015
    #4
  7. Jul 25, 2015 #5
    jr33187

    jr33187 Bobtail Member

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    Hi........i just turned the truck on, checked with a test light the switch behind the dash with 2 wires coming out and both had elect current flowing thru with test light. I turned truck off and kept pressing brakes until air in lines were almost gone, thats when brake lights shut off. Is there another sensor where this air and elect meet that could be stuck?
     
    Last edited by a moderator: Jul 26, 2015
    jr33187, Jul 25, 2015
    jr33187, Jul 25, 2015
    #5
  8. Jul 25, 2015 #6
    BoxCarKidd

    BoxCarKidd Road Train Member

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    There are at least two brake light switches, primary and secondary, plus other air switches.
     
    BoxCarKidd, Jul 25, 2015
    BoxCarKidd, Jul 25, 2015
    #6
  9. Jul 25, 2015 #7
    jr33187

    jr33187 Bobtail Member

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    Jul 25, 2015
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    Are they under the hood? I found one behind the dash.
     
    jr33187, Jul 25, 2015
    jr33187, Jul 25, 2015
    #7
  10. Jul 26, 2015 #8
    jr33187

    jr33187 Bobtail Member

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    Jul 25, 2015
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    Is this the primary? Behind the dash
     

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    jr33187, Jul 26, 2015
    jr33187, Jul 26, 2015
    #8
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