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Air leak

Discussion in 'Trucks [ Eighteen Wheelers ]' started by heavyhaulerss, Jul 25, 2019.

  1. Jul 25, 2019 #1
    heavyhaulerss

    heavyhaulerss Road Train Member

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    97 freightliner fld secondary gauge losing air 120 lbs to 5 lbs in 15 min. Where to start looking for leak. I have 4 air tanks.
     
    heavyhaulerss, Jul 25, 2019
    heavyhaulerss, Jul 25, 2019
    #1
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  3. Jul 25, 2019 #2
    Hegemeister

    Hegemeister Road Train Member

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    Might be a able to hear the leak. Take it to a quiet area and closely listen in all the areas.
     
    Hegemeister, Jul 25, 2019
    Hegemeister, Jul 25, 2019
    #2
    heavyhaulerss Thanks this.
  4. Jul 25, 2019 #3
    Hegemeister

    Hegemeister Road Train Member

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    Does it lose air without the brakes applied?
     
    Hegemeister, Jul 25, 2019
    Hegemeister, Jul 25, 2019
    #3
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  5. Jul 25, 2019 #4
    mitmaks

    mitmaks Road Train Member

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    Set trailer brake, choke wheels and release tractor parking brake. Get out of the truck and listen for air leaks
     
    mitmaks, Jul 25, 2019
    mitmaks, Jul 25, 2019
    #4
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  7. Jul 25, 2019 #5
    RustyBolt

    RustyBolt Road Train Member

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    Agree with others. That much loss should be very audible.
     
    RustyBolt, Jul 25, 2019
    RustyBolt, Jul 25, 2019
    #5
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  8. Jul 25, 2019 #6
    Hegemeister

    Hegemeister Road Train Member

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    Does it happen with valves out? If so, this will narrow down the possibilities. If not, try it with one valve in at a time and try to isolate the leak.

    Example. Trailer or truck. Emergency pressure or brake application pressure.
    This can all be done right from the cab.
     
    Hegemeister, Jul 25, 2019
    Hegemeister, Jul 25, 2019
    #6
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  9. Jul 25, 2019 #7
    brysol01

    brysol01 Medium Load Member

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    don"t forget the spray bottle of soapy water, my first truck was a 97 FLD 4 axel
    to run paper from Ponderay to Salt Lake, great truck till Freedom Freightliner in
    Spokane rebuilt the engine
     
    brysol01, Jul 25, 2019
    brysol01, Jul 25, 2019
    #7
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  10. Jul 25, 2019 #8
    062

    062 Road Train Member

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    Do you have a dump valve? Dump your bags and see what happens. If no change at least you eliminated one part of the system.
     
    062, Jul 25, 2019
    062, Jul 25, 2019
    #8
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  11. Jul 25, 2019 #9
    heavyhaulerss

    heavyhaulerss Road Train Member

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    Thank you. all. I found it. It is some sort of pressure relief valve on the short air tank. Looks like a button on 1 side and it was pouring air. freightliner had it in stock. Much appreciate the help.
     
    heavyhaulerss, Jul 25, 2019
    heavyhaulerss, Jul 25, 2019
    #9
    uncleal13, 062 and RustyBolt Thank this.
  12. Jul 25, 2019 #10
    uncleal13

    uncleal13 Road Train Member

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    A59ED954-0014-434C-9E22-F38BBE62D10F.png I use one of these Ultrasonic Leak Detector. It’s the cats meow.
    I’ve found leaks I didn’t even know I had. My truck use to go 20 minutes between compressor purges. Now I goes two hours and I pull two trailers.
     
    uncleal13, Jul 25, 2019
    uncleal13, Jul 25, 2019
    #10
    heavyhaulerss and Hegemeister Thank this.
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