2015 389 Peterbilt

Discussion in 'Trucks [ Eighteen Wheelers ]' started by KittyKicker, Nov 13, 2019.

  1. KittyKicker

    KittyKicker Light Load Member

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    My brake lights stay on when the main instrument cluster is on. If I open the door or have the truck on the brake lights will not go out. If the truck is off and I open the door the dashboard cluster will come on and so will the brake lights. If I push the button in the door jam and hold it, all the lights will go out after a few seconds.
     
  2. Roberts450

    Roberts450 Road Train Member

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    Is it just like 2 of the diode’s in the led brake lights that come on and very dimly?? I think that’s standard as the 2013 and the 2018 I have now both do this.
     
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  3. pushbroom

    pushbroom Road Train Member

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    Yeah its normal. Lights are not actually on, just dimly back lit.
     
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  4. KittyKicker

    KittyKicker Light Load Member

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    No, it is the full brake light, just like if you press the brake pedal.
     
  5. KittyKicker

    KittyKicker Light Load Member

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    Plot twist: the applied brake pressure gauge is reading 50psi with the brakes released. There is no air line that runs to the gauge. The brakes are not actually being applied. Lights are still stuck on.
     
  6. pushbroom

    pushbroom Road Train Member

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    Brake application sensor is probably stuck in range then. Located to the rh of the steering column accessed by the kick panel.
     
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  7. KittyKicker

    KittyKicker Light Load Member

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    Do you know what it looks like? Could that be what is making the brake lights stay on?
     
  8. Goodysnap

    Goodysnap Road Train Member

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    Should be a 3 wire pressure transducer. There will be many down there all the same. Harness/connector should be labeled. Transducers will be the same so you can swap to test.
     
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  9. Dave_in_AZ

    Dave_in_AZ Road Train Member

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    Try turning your main power switch off for like 5 minutes.

    Let the chassis controller reboot.
     
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  10. KittyKicker

    KittyKicker Light Load Member

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    Could that also be the reason why the brake lights won't turn off?
     
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