What is valve called that releases air from airbags on tractor?

Discussion in 'Ask An Owner Operator' started by Forever237, Aug 10, 2022.

  1. Forever237

    Forever237 Light Load Member

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    Mine is working abnormally. When hooked to trailer and pressure on air bags rises it opens up and leaks.
    What is it called?
     
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  3. D.Tibbitt

    D.Tibbitt Road Train Member

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  4. Forever237

    Forever237 Light Load Member

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    I’m the one asking here lol
    Does it release air when bags are under pressure?
     
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  5. Catmando

    Catmando Road Train Member

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    This ^^^^^^
     
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  6. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    It doesn't release air under pressure though. Do you have s pic where it's leaking?
     
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  7. Forever237

    Forever237 Light Load Member

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    Several times tried to catch the leak unsuccessfully.
    So, I have previous posts about my truck having problem with my air dryer. When going uphill it is working fine. As soon as I start descending, purge valve on airdryer starts purging every thirty seconds until it stops (I don’t know why… overwhelmed maybe) and air tank pressure goes up to 145 psi until Safety Valve starts releasing air. Yesterday at dark I stopped to take a look and something is leaking somewhere in rear suspension area.
    My guess is at uphill angles this leveling valve is fine but leaks at downhill which would explain why purge valve starts kicking every 30 sec or less.
    Is my theory realistic because I’m changing leveling valve tomorrow? Or am I wasting money?
     
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  8. RebelChick

    RebelChick Road Train Member

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    Is it making a rapid tsk, tsk, tsk noise repeatedly until your alarms come on for your air pressure?
     
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  9. Forever237

    Forever237 Light Load Member

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    When I’m unhooked from trailer,
    No. It is leaking only when driving. Especially after uphill going downhill. Like I mentioned above, after downhill yesterday I stopped briefly to see what’s going on. Noticed vivid leak from rear side (constant leak). Was on very narrow street, nobody around, in the dark. So decided to find safer place. The next stop, leak is gone.
     
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  10. 77fib77

    77fib77 Road Train Member

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    It might be it leaks when then line deflects out of position. Is a leveling valve a lot of money? You could change it out and see if it fixes it. If I push on mine side to side it leaks but I haven't changed it yet. It's not horrid.
     
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  11. D.Tibbitt

    D.Tibbitt Road Train Member

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    So get under there with some soap and water and find where it's coming from. To me it sounds like a leveling valve. It will exhaust air out of it if the o ring inside is shot
     
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