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problem with brake lights

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by jeffl0123, Mar 25, 2020.

  1. Mar 25, 2020 #1
    jeffl0123

    jeffl0123 Light Load Member

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    Hey guys,
    I have a 1999 International 8100. The problem is the brake lights work, but they will not work unless you really bare down pushing the brake pedal. So when you lightly push on the brake, pretty much like you would normally when coming to a stop, no brake lights. So I dont think this is a switch issue. I think this could be a treadle valve issue. Any thoughts as if I am going the right route on this?
     
    jeffl0123, Mar 25, 2020
    jeffl0123, Mar 25, 2020
    #1
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  3. Mar 25, 2020 #2
    AModelCat

    AModelCat Road Train Member

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    Easy peazy. Find the brake light switch (should be a pressure switch) and see if it closes when you press on the pedal.
     
    AModelCat, Mar 25, 2020
    AModelCat, Mar 25, 2020
    #2
  4. Mar 25, 2020 #3
    jeffl0123

    jeffl0123 Light Load Member

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    Jan 18, 2018
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    Yeah that seems to be my problem. There are 2 pressure switches on the treadle valve, but when I unplug both of them, still get the brake lights. Not sure where this thing could be. Cant find it on outside on the firewall and so far cant find it beneath the dash.
     
    jeffl0123, Mar 25, 2020
    jeffl0123, Mar 25, 2020
    #3
  5. Mar 25, 2020 #4
    AModelCat

    AModelCat Road Train Member

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    Bet ya those 2 switches are for your low air buzzer/light.

    @Heavyd might be able to direct you towards the switch's location.
     
    AModelCat, Mar 25, 2020
    AModelCat, Mar 25, 2020
    #4
    Heavyd Thanks this.
  7. Mar 25, 2020 #5
    jeffl0123

    jeffl0123 Light Load Member

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    Ok thanks.
     
    jeffl0123, Mar 25, 2020
    jeffl0123, Mar 25, 2020
    #5
  8. Mar 25, 2020 #6
    Heavyd

    Heavyd Road Train Member

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    I think those are in a super fun spot up behind the dash above the pedals somewhere. I can't remember exactly, but the wiring diagram shows they are inside. Follow the air lines from the foot valve.
     
    Heavyd, Mar 25, 2020
    Heavyd, Mar 25, 2020
    #6
  9. Mar 25, 2020 #7
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Above the go pedal I thank. There are two low air switch / gauge senders with tees as well.
    Try unplugging the wires to see what that does first.Them maybe put a jumper wire in the plug if you thank it maybe the brake light switch. I do not remember exactly as well but thank it should have two brake light switches.
    If you can get a number off the switch dealer can tell you what it is.
     
    BoxCarKidd, Mar 25, 2020
    BoxCarKidd, Mar 25, 2020
    #7
  10. Mar 25, 2020 #8
    Rideandrepair

    Rideandrepair Road Train Member

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    My Freightliner has both of them plumbed into the parking brake.
     
    Rideandrepair, Mar 25, 2020
    Rideandrepair, Mar 25, 2020
    #8
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