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I have air in both tanks. But I have no pressure on my secondary gauge. 2014 Peterbilt 386.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Donman123, Sep 16, 2022.

  1. Sep 16, 2022 #1
    Donman123

    Donman123 Bobtail Member

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    Can anyone tell me why my secondary gauge isn't showing air, if there's are in the tank?
     
    Donman123, Sep 16, 2022
    Donman123, Sep 16, 2022
    #1
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  3. Sep 16, 2022 #2
    loudtom

    loudtom Road Train Member

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    loudtom, Sep 16, 2022
    loudtom, Sep 16, 2022
    #2
  4. Sep 16, 2022 #3
    Donman123

    Donman123 Bobtail Member

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    The machanic opened the panels in the floor. Went underneath truck looking.
    All of a sudden it went back to working.
    Seems like bad connectors?
     
    Donman123, Sep 16, 2022
    Donman123, Sep 16, 2022
    #3
  5. Sep 16, 2022 #4
    Donman123

    Donman123 Bobtail Member

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    Thanks for the info. Now I have a start to troubleshoot.
    I think you hit it right on the head.
    Probably unrelated... But why would I lose air so fast when using my foot brakes?
    While backing, or in traffic... The air pressure drops really fast. Until I'm stuck.
    My haul frac sand. There's lots of maneuvering on the well pad. If I have to rev the engine it blows dust on everyone there.
    Any idea why I'm losing air so fast?
     
    Donman123, Sep 16, 2022
    Donman123, Sep 16, 2022
    #4
  7. Sep 16, 2022 #5
    loudtom

    loudtom Road Train Member

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    You'll need one person to apply the brakes and another to listen and feel and/or spray soapy water to find the leaks. It could be your ABS modulators, or it could be a bad diaphragm in the brake chamber, even a bad hose somewhere.
     
    loudtom, Sep 16, 2022
    loudtom, Sep 16, 2022
    #5
  8. Sep 16, 2022 #6
    Donman123

    Donman123 Bobtail Member

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    Funny you mention ABS modulator.
    My ABS light (located on rear) isn't working. Ideas?
     
    Donman123, Sep 16, 2022
    Donman123, Sep 16, 2022
    #6
  9. Sep 16, 2022 #7
    loudtom

    loudtom Road Train Member

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    Usually that's from people cutting the wires to the light on the trailer. Follow the wires from the light and you should see if that's the case. If it's not obvious, get a multimeter and test the light and wires.
     
    loudtom, Sep 16, 2022
    loudtom, Sep 16, 2022
    #7
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