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Massive Air Leak Behind Fifth Wheel

Discussion in 'Experienced Truckers' Advice' started by jldilley, Jul 21, 2022.

Page 1 of 2
  1. Jul 21, 2022 #1
    jldilley

    jldilley Medium Load Member

    477
    394
    Oct 13, 2013
    Indianapolis, In
    0
    I’m losing a lot of air from the air service manifold located between the frame rails. Air is leaking out the bottom at a high rate. See pictures for reference.
     

    Attached Files:

    jldilley, Jul 21, 2022
    jldilley, Jul 21, 2022
    #1
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  3. Jul 21, 2022 #2
    Concorde

    Concorde Road Train Member

    2,947
    8,370
    Jun 29, 2016
    West Melbourne Florida
    0
    Time to replace it. I had to replace one on my 2014 T-680..

    I can’t remember what it’s called..dump valve??
    Wasn’t very expensive.
     
    Concorde, Jul 21, 2022
    Concorde, Jul 21, 2022
    #2
    Rideandrepair and jldilley Thank this.
  4. Jul 21, 2022 #3
    Cattleman84

    Cattleman84 Road Train Member

    9,602
    67,009
    Nov 1, 2017
    The Sticks, Idaho
    0
    Just replace it... They are easy to do.

    A possible temporary fix is to use a blunt object to bump the diaphragm in the bottom a few times... Sometimes it works, sometimes it dont.
     
    Cattleman84, Jul 21, 2022
    Cattleman84, Jul 21, 2022
    #3
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  5. Jul 21, 2022 #4
    jldilley

    jldilley Medium Load Member

    477
    394
    Oct 13, 2013
    Indianapolis, In
    0
    For reference the tractor is a 2012 Freightliner Cascadia
     
    Last edited: Jul 21, 2022
    jldilley, Jul 21, 2022
    jldilley, Jul 21, 2022
    #4
    Rideandrepair Thanks this.
  7. Jul 21, 2022 #5
    Concorde

    Concorde Road Train Member

    2,947
    8,370
    Jun 29, 2016
    West Melbourne Florida
    0
    Just get a new valve and replace it yourself..easy job to do
     
    Concorde, Jul 21, 2022
    Concorde, Jul 21, 2022
    #5
    Rideandrepair, jldilley and baha Thank this.
  8. Jul 21, 2022 #6
    kylefitzy

    kylefitzy Road Train Member

    4,001
    16,469
    Aug 12, 2007
    Kansas city,Mo
    0
    Before you replace the valve take both hoses off at the valve. There shouldn’t be any air coming out of the hoses. You could have a blown brake diaphragm if the leak is happening with your parking brakes released.
     
    kylefitzy, Jul 21, 2022
    kylefitzy, Jul 21, 2022
    #6
    Jacoooooooo, tscottme, AModelCat and 2 others Thank this.
  9. Jul 21, 2022 #7
    jldilley

    jldilley Medium Load Member

    477
    394
    Oct 13, 2013
    Indianapolis, In
    0
    It’s not happening with the brakes released.
    It’s called a quick release valve.
     
    jldilley, Jul 21, 2022
    jldilley, Jul 21, 2022
    #7
    Rideandrepair and kylefitzy Thank this.
  10. Jul 21, 2022 #8
    Big Road Skateboard

    Big Road Skateboard Road Train Member

    4,395
    20,921
    May 2, 2021
    0
    Leaking with brakes released, or when applying service brakes?
     
    Big Road Skateboard, Jul 21, 2022
    Big Road Skateboard, Jul 21, 2022
    #8
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  11. Jul 21, 2022 #9
    nikmirbre

    nikmirbre Road Train Member

    5,057
    8,718
    Jul 27, 2011
    High Point NC
    0
    Yeah I had one on my truck go bad about a year ago on a friday afternoon....I had it replaced at loves all for about $80. This was after I thought it was a brake chamber and sat in the parking lot and replaced the brake chamber.
     
    nikmirbre, Jul 21, 2022
    nikmirbre, Jul 21, 2022
    #9
    Rideandrepair and jldilley Thank this.
  12. Jul 21, 2022 #10
    jldilley

    jldilley Medium Load Member

    477
    394
    Oct 13, 2013
    Indianapolis, In
    0
    I changed the quick release valve in the Freightliner parking lot. $70 part. Three hour job. Truck is working fine now. Thanks for all of your help.
     
    jldilley, Jul 21, 2022
    jldilley, Jul 21, 2022
    #10
    tscottme, Cattleman84, Concorde and 1 other person Thank this.
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