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2000 Peterbilt 379 brake/cruise

Discussion in 'Trucks [ Eighteen Wheelers ]' started by HosRanch, Jul 7, 2023.

Page 1 of 3
  1. Jul 7, 2023 #1
    HosRanch

    HosRanch Bobtail Member

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    Mar 6, 2023
    Emory Tx
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    When the brake is applied the cruise control does not cancel, I have replaced, the stop and all the pressure sensors in the manifold (pictured). I am assuming there is another switch/sensor somewhere? I have searched threads and haven't been able to find this info. Any help would be appreciated
     

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    HosRanch, Jul 7, 2023
    HosRanch, Jul 7, 2023
    #1
    jamespmack Thanks this.
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  3. Jul 7, 2023 #2
    blairandgretchen

    blairandgretchen Road Train Member

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    Does it cancel if you pull the Johnny bar - tap the clutch - toggle cruise switch on dash?

    And - do tractor brake lights activate on pedal brake push/Johnson valve?
     
    blairandgretchen, Jul 7, 2023
    blairandgretchen, Jul 7, 2023
    #2
    jamespmack Thanks this.
  4. Jul 7, 2023 #4
    HosRanch

    HosRanch Bobtail Member

    8
    7
    Mar 6, 2023
    Emory Tx
    0
    Yes, the clutch will kill the cruise control. The cruise toggles work normal (,high idel, ect). The brake lights do work as normal as well. The hand brake does activate the stop lights too. But neither the foot brake or hand valve will cancel the cruise control when applied.
     
    HosRanch, Jul 7, 2023
    HosRanch, Jul 7, 2023
    #4
    jamespmack and blairandgretchen Thank this.
  5. Jul 7, 2023 #4
    blairandgretchen

    blairandgretchen Road Train Member

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    South west Missouri
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    I’ve got a 1995 - the ground circuit for the cruise had been hacked into for an accessory, messed up the cruise circuit.

    Unit new to you?
     
    blairandgretchen, Jul 7, 2023
    blairandgretchen, Jul 7, 2023
    #4
    jamespmack Thanks this.
  7. Jul 7, 2023 #5
    blairandgretchen

    blairandgretchen Road Train Member

    13,302
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    Dec 9, 2011
    South west Missouri
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    blairandgretchen, Jul 7, 2023
    blairandgretchen, Jul 7, 2023
    #5
    jamespmack Thanks this.
  8. Jul 7, 2023 #6
    bad-luck

    bad-luck Road Train Member

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    I believe this is the is the sensor. Have you checked that one of the wires are hot?
     
    bad-luck, Jul 7, 2023
    bad-luck, Jul 7, 2023
    #6
  9. Jul 7, 2023 #7
    bad-luck

    bad-luck Road Train Member

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    Screenshot_20230707_184925_Chrome.jpg
     
    bad-luck, Jul 7, 2023
    bad-luck, Jul 7, 2023
    #7
  10. Jul 7, 2023 #8
    HosRanch

    HosRanch Bobtail Member

    8
    7
    Mar 6, 2023
    Emory Tx
    0
    I replaced that one too, applied brake still doesn't kill the cruise
     
    HosRanch, Jul 7, 2023
    HosRanch, Jul 7, 2023
    #8
  11. Jul 7, 2023 #9
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    You did check the ones on both sides?
     
    Big Road Skateboard, Jul 7, 2023
    Big Road Skateboard, Jul 7, 2023
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    Oxbow Thanks this.
  12. Jul 7, 2023 #10
    Goodysnap

    Goodysnap Road Train Member

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    Jul 12, 2017
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    The engine is not seeing brake applied signal.

    What engine? Has it ever worked?
     
    Goodysnap, Jul 7, 2023
    Goodysnap, Jul 7, 2023
    #10
    blairandgretchen and Oxbow Thank this.
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