Volvo 780 front air bags deflating

Discussion in 'Trucks [ Eighteen Wheelers ]' started by hunts2much, Jan 26, 2011.

  1. hunts2much

    hunts2much Medium Load Member

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    I drive a Volvo 780 which has air bags on the steer axle. After the truck has been shut off for a few hours BOTH bags completely deflate. I can not see (soapy water and spray bottle) nor here where the air is leaking from. They both inflate quickly when I start the truck and the compressor has no problem keeping them inflated but I would like to get this fixed IMMEDIATELY before I get placed oos.

    Anybody have any suggestions to help me locate the leak?
     
  2. Trouble65

    Trouble65 Medium Load Member

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    Follow the lines and spray water on each connection. Also check the front suspension air ride leveling valve.
     
  3. Pablo-UA

    Pablo-UA Road Train Member

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    Is your truck with ECAS ore just levelling valve on front axe?
     
  4. hunts2much

    hunts2much Medium Load Member

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    Not sure what ECAS is but it does have a leveling valve on the front, which is less than a month old.
     
  5. Pablo-UA

    Pablo-UA Road Train Member

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    sometimes levelling valve looses air and no sssss sound. so the only way is to get bottle with soap water and find problem from underneath
     
  6. me myself and I

    me myself and I Light Load Member

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    Check air tanks. Thats what happened to me. Front tank was leaking thru bad weld.
     
    Last edited: Feb 3, 2011
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  7. Pablo-UA

    Pablo-UA Road Train Member

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    Do not fix tank with welding yourself. Just advice
     
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  8. heavyhaulerss

    heavyhaulerss Road Train Member

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    Let J.B. weld it for ya. :biggrin_2559:
     
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  9. josh.c

    josh.c Road Train Member

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    Make sure you get the five-minute kind though, 'cause you gotta go!:biggrin_2559:
     
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  10. MedicineMan

    MedicineMan Road Train Member

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    the bags going flat after a few HOURS is not an OOS violation. the only oos violation is if there was an audable leak bad enough that the compressor couldn't keep up
     
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