Air leak

Discussion in 'Trucks [ Eighteen Wheelers ]' started by heavyhaulerss, 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.
     
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  3. 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.
     
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  4. Hegemeister

    Hegemeister Road Train Member

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    Does it lose air without the brakes applied?
     
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  5. 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
     
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  6. RustyBolt

    RustyBolt Road Train Member

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    Agree with others. That much loss should be very audible.
     
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  7. 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.
     
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  8. brysol01

    brysol01 Light 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
     
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  9. 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.
     
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  10. 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.
     
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  11. 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.
     
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