Newer truck air leak

Discussion in 'Trucks [ Eighteen Wheelers ]' started by beemergary, Sep 26, 2014.

  1. beemergary

    beemergary Light Load Member

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    Is there such a thing as a truck that don't leak air? Have an older Pete and have found a few air leak gremlins. Fittings, relay valve, leveling valve to name a few. Have gone thru lots of kids bubbles and can't figure out the leak. Even checked the intake on the compressor. Do I need to just give up?
     
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  3. xsetra

    xsetra Road Train Member

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    air bags, silent leak at bottom of bags.
     
  4. barroll

    barroll Road Train Member

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    I think if you can hold 100psi in the tanks over 12 hours you're as good as you need to be and thensome.
     
    Raiderfanatic Thanks this.
  5. tsavory

    tsavory Road Train Member

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    Got one I cant find either drops to 60psi drom 120 in 5hrs
     
  6. barroll

    barroll Road Train Member

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    Have either of you smoke tested the air lines yet? The easy way is to hook up a smoke machine to a T fitting after the air drier, run it for a few minutes, then pressurize the system and start looking for where the smoke rolls out. You can test what's upstream of the drier by filling the compressor pickup line with smoke then running it.

    The problem with the bubble test is you have to know where to put the liquid to get a positive result. The smoke test comes out to greet you, and introduce you to what you'll be spending money on.
     
    tsavory and Vintage Thank this.
  7. beemergary

    beemergary Light Load Member

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    My suspension would go down when the air would drop. Put a check valve in the line to height valve and now the suspension stays up when the air drops.
     
  8. Caterpillar Cowboy

    Caterpillar Cowboy Heavy Load Member

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    Tip on Pete style air bags that bolt into the top of the bags, put Teflon tape on your bolts.
     
  9. beemergary

    beemergary Light Load Member

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    Like baroll said a smoke test would be the way too go. I may try putting a check valve in the line too trans (13 speed). If those air valves were leaking internally you wouldn't know it.
     
  10. mtoo

    mtoo Road Train Member

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    unhook the leveling valve, then put more air in the bags, now spray around the bags. I use a pump up garden sprayer, that way you can saturate the whole frame and every valve and line you can find.

    I once found the airline going to the fan clutch bleeding air thru the jacket of the line. The whole length of the line was bleeding. Good luck.
     
  11. Oscar the KW

    Oscar the KW Going Tarpless

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    Then your leak is between that check valve and the tank that supplies it.
     
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