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No pressure build

Discussion in 'Questions From New Drivers' started by Enrique95, Jun 6, 2025.

  1. Jun 6, 2025 #1
    Enrique95

    Enrique95 Bobtail Member

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    Jun 6, 2025
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    Freightliner cascadia evolution 2016



    Hey guys I can’t seem to find the problem with my Freightliner , my psi dropped to 40-60 I searched for a leak but can’t seem to find one, governor is new, air tanks emptied out , now my airbags are deflated I don’t feel pressure going to airbag lines , any help suggestions?
     
    Enrique95, Jun 6, 2025
    Enrique95, Jun 6, 2025
    #1
    77fib77 and nextgentrucker Thank this.
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  3. Jun 6, 2025 #2
    Ridgeline

    Ridgeline Road Train Member

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    You didn't mention the engine.

    I had a problem with a couple of trucks using a 'direct replacement' governor, they were not a direct replacement, one line had to be switched.
     
    Ridgeline, Jun 6, 2025
    Ridgeline, Jun 6, 2025
    #2
    Enrique95 Thanks this.
  4. Jun 6, 2025 #3
    Concorde

    Concorde Road Train Member

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    Jun 29, 2016
    West Melbourne Florida
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    With the engine running is your compressor engaged and pumping air?

    If the compressor isn’t kicking on it will probably be your unloader valve.

    I’m definitely not a mechanic by any means but it sounds similar to what I’ve gone through before.
     
    Concorde, Jun 6, 2025
    Concorde, Jun 6, 2025
    #3
    77fib77, Enrique95 and nextgentrucker Thank this.
  5. Jun 6, 2025 #4
    Ex-Trucker Alex

    Ex-Trucker Alex Road Train Member

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    Bad governor, or a worn-out compressor comes to mind...
     
    Ex-Trucker Alex, Jun 6, 2025
    Ex-Trucker Alex, Jun 6, 2025
    #4
    77fib77 and Enrique95 Thank this.
  7. Jun 10, 2025 #5
    Enrique95

    Enrique95 Bobtail Member

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    Jun 6, 2025
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    Thank you guys for response in the end I checked every single one of your suggestions and it turned out to be the air hose that is connected to the compressor, tho u couldn’t see it because of the. 90 fitting and being tucked underneath the cab and between the frame itself . Thank you guys
     
    Enrique95, Jun 10, 2025
    Enrique95, Jun 10, 2025
    #5
    kemosabi49, wulfman75 and Concorde Thank this.
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