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Question about coupling/uncoupling - I heard a weird noise !

Discussion in 'Questions From New Drivers' started by 762x39, Oct 27, 2015.

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  1. Oct 27, 2015 #1
    762x39

    762x39 Bobtail Member

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    Oct 16, 2015
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    Hello all. Newbie driver here. I have a 2016 freightliner cascadia. Earlier today I did a normal drop and hook. Wierd thing is that after I uncoupled the trailer and drove away, I heard a wierd noise comming from the back of the tractor. Almost sounded like a dragging noise. I get out and look and nothing appears to be wrong with the tractor/bob tail.

    I asked another driver who happened to be there and he said that sometimes that "noise" happens and it has to do with the airbags -and that there's nothing to worry about.

    Can someone please explain this to me? I'm a newbie so any little thing happens concerns me. Thanks in advance.
     
    762x39, Oct 27, 2015
    762x39, Oct 27, 2015
    #1
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  3. Oct 27, 2015 #2
    Chinatown

    Chinatown Road Train Member

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    He's probably correct; it was the air bags.
     
    Chinatown, Oct 27, 2015
    Chinatown, Oct 27, 2015
    #2
    Longarm Thanks this.
  4. Oct 27, 2015 #3
    762x39

    762x39 Bobtail Member

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    Thanks for the reply. What is the airbag doing and why does it make the noise? Is it bad? Is there a way to prevent it from happening again? Thanks
     
    762x39, Oct 27, 2015
    762x39, Oct 27, 2015
    #3
  5. Oct 27, 2015 #4
    S M D

    S M D Road Train Member

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    Did you pull your air lines off? Maybe they came off and made the noise after recoiling lol. It happens!.

    And did,you have the bags aired out? Could be bump stop
     
    S M D, Oct 27, 2015
    S M D, Oct 27, 2015
    #4
    77fib77 and lots of character Thank this.
  7. Oct 27, 2015 #5
    201

    201 Road Train Member

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    Hi 762, when you pull away from the trailer, especially if it was a heavy load, it takes a while for the suspension air to "bleed off", so the sound you probably heard, was the air exhausting out the ride height valve, and I suppose it could sound like something dragging. To eliminate that, after you pull away from the pin, stop before pulling all the way out, and there should be a switch on the dash, that says "air suspension, run- dump" or "deflate" or something like that, put it in "dump" or "deflate", and it will release the air a lot faster. Just remember to re-inflate the suspension, once you pull away.
     
    201, Oct 27, 2015
    201, Oct 27, 2015
    #5
    okiedokie Thanks this.
  8. Oct 27, 2015 #6
    okiedokie

    okiedokie Road Train Member

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    Dumping your air "prior" to getting out from under the trailer relieves alot of dramatic weight/pressure off the landing gear.
     
    okiedokie, Oct 27, 2015
    okiedokie, Oct 27, 2015
    #6
    201 and HotH2o Thank this.
  9. Oct 30, 2015 #7
    762x39

    762x39 Bobtail Member

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    Thanks for the replies guys. I asked a few pro drivers are the truck stop and they all said the same thing you all said about releasing airbag air before pulling away from landed trailer.

    How do I deflate air? I have cascadia 2016.

    thanks again guys
     
    762x39, Oct 30, 2015
    762x39, Oct 30, 2015
    #7
  10. Oct 30, 2015 #8
    AModelCat

    AModelCat Road Train Member

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    Should be a dash switch. Will probably have a picture of a truck with an arrow pointing down or something similar.
     
    AModelCat, Oct 30, 2015
    AModelCat, Oct 30, 2015
    #8
  11. Oct 30, 2015 #9
    Pmracing

    Pmracing Road Train Member

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    Engage the air deflate control. whether it is a rocker switch on the dash or a handheld type remote on the floor.

    Depending on your tractor's build, you may not have the option.

    I had a loaner cascadia that had this remote type control attached by a coiled cord positioned on the floor on the left side of the driver seat. I can only assume it was intended for the driver to be outside the truck and monitoring the air dump.

    [​IMG]


    It took a while to figure out the routine. I had to press the button that looks like a music note then use the up/down arrows. I only ever used down because it would auto-inflate after the truck was in motion for a moment or two.
    Mikeeee
     
    Last edited: Oct 30, 2015
    Pmracing, Oct 30, 2015
    Pmracing, Oct 30, 2015
    #9
  12. Oct 30, 2015 #10
    Davezilla

    Davezilla Medium Load Member

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    If you heard a puffing noise with the dragging, it was actually tires losing traction as the airbags are leveling. The airbags dont adjust right away, and so one of the axles can be slightly off the ground for a few seconds. The truck will lightly fire the airbrake on the spinning wheel in order to help stop it. Usually it wouldnt sound like a dragging noise, but on gravel it can be very noticeable.

    It is very very common for a wheel to slip right after disconnecting, and the traction control will set off the airbrakes in little puffs to stop it.
     
    Davezilla, Oct 30, 2015
    Davezilla, Oct 30, 2015
    #10
    Pmracing and STexan Thank this.
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