New Job, possible issue with Trainer's truck

Discussion in 'Questions From New Drivers' started by Labrador, Sep 27, 2023.

  1. keebler13579

    keebler13579 Heavy Load Member

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    What kemosabi49 said makes sense if the trailers are set up that way. It does take time to fill the air tanks
     
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  3. roundhouse

    roundhouse Road Train Member

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    When you pull the yellow button to apply the tractor parking brakes , the red trailer brake button will almost always pop out at the same time unless you hold the red button in with your thumb .

    I don’t see a problem with this
    Just do as the trainer says and keep your thumb on the red button so it won’t pop out .

    Its almost like they designed it that way
    You hook your forefinger behind the top corner of the yellow button and middle finger under the bottom corner , hold your thumb on the red button , and pull the yellow button out


    If the trailer is plumbed so the air bags dump every time you pop the red button and apply the trailer brakes , then yea, it will take several minutes to inflate them and build enough air in the tanks to release the trailer parking brakes .

    as for the brakes being grabby , I have no clue.

    If the gladhand lines were hooked up backwards , the trailer parking brakes wouldn’t release at all .
     
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  4. Labrador

    Labrador Medium Load Member

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    Ok fair enough, maybe it is fine. I want to get him to let me do a tug test on it in the morning, if it does that ok then I won't worry about it.
     
  5. roundhouse

    roundhouse Road Train Member

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    You wanting to do the tug test with the trailer parking brake applied ?
    Or using the trolly handle ?

    assuming your tractor has a trolly handle or Johnny bar handle or whatever the lever on the right side of the steering wheel that activates the trailer service brakes is called .

    my nephew is a driver and he never sets the trailer brake when they park at night ,
    Said it takes too long to air it back up in the morning .

    but they leave the rig idling All night ,

    some trailers may leak down overnight if the tractor is not runnning
     
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  6. NewWorldTrucker

    NewWorldTrucker Light Load Member

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    Honestly, you’re in training. It’s not your vehicle. Just follow directions and complete your training and when you get into your own vehicle bring any suspected problems to the shops attention. I’m just being real with ya.
     
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  7. Long FLD

    Long FLD Road Train Member

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    $20 says it dumps the bags when you exhaust the air supply to the trailer. Then you have to wait for everything to air back up before the brakes release.

    If the lines weren’t hooked up correctly you wouldn’t be supplying air to the trailer.
     
  8. Labrador

    Labrador Medium Load Member

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    The trailer parking brake. I don't think it has a trolly handle.
     
  9. Magoo1968

    Magoo1968 Road Train Member

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    In winter when you see all the trucks with frozen trailer brakes after a storm you’ll be happy your trainer taught you not to set them every stop.. unless you’re on a big grade tractor brakes are enough if they are in proper operating condition. Aka no broken springs or misadjusted .
     
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  10. loudtom

    loudtom Road Train Member

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    When I bought my trailer it had what sounds like the exact same problem. It took like 10 minutes for the brakes to release after supplying air, and light foot pressure would cause heavy braking. We had a mobile repair guy come out and he fixed it. The receipt shows part# KN26120, but yours might be different. It's listed online as a trailer brake control valve. The valve is installed on the trailer air tank. Hopefully this helps.

    KN26110 is for service brake priority. It requires the trailer tank to be filled prior to spring brakes being released.
     
    Last edited: Sep 28, 2023
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  11. Labrador

    Labrador Medium Load Member

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    Well the trainer says it behaves this way for all trailers he connects to
     
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