Air Suspension Gauge hookup question.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by LoneRanger, Sep 17, 2021.

  1. LoneRanger

    LoneRanger Road Train Member

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    I’ve looked at instructions on a right way air suspension gauge installation and it looks straightforward. My question is instead of using one airbag for the source possibility of using 4 airbags.

    here is what I am thinking. Install T fittings on all airbags, connect the main lines coming in to the T fittings, then connect the other outlets to a 4 way fitting and run the 1/4 hose to the gauge.

    This way all 4 airbags are equalized under pressure and I’m thinking this would give a better reading.


    Any thoughts if this is a better way? Or just stick to the instructions.
     
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  3. Ross_Tech

    Ross_Tech Light Load Member

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    It's unnecessary. The pressure will be the same because they're all connected to together. Here's the science from Wikipedia:
    Pascal's principle is defined as

    A change in pressure at any point in an enclosed fluid at rest is transmitted undiminished to all points in the fluid.

    Pressure exerted on a fluid in an enclosed container is transmitted equally and undiminished to all parts of the container and acts at right angle to the enclosing walls.

    Alternate definition: The pressure applied to any part of the enclosed liquid will be transmitted equally in all directions through the liquid.
     
  4. Magoo1968

    Magoo1968 Medium Load Member

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    The instructions will also say to check on flat level ground so each bag is extended the same amount.
     
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  5. Lazer

    Lazer Medium Load Member

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    No need, why have all those extra connections, with each one a ‘risk’? Within a few seconds all the air bags are equal anyway.
     
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  6. LoneRanger

    LoneRanger Road Train Member

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    I’m not familiar with air suspensions and I learn as I go. I was thinking the same but since I don’t know how the valves operate or if each airbag is isolated in the system or not, that is why I was thinking about equalizing the system.

    I appreciate the feedback and information.
     
  7. Ross_Tech

    Ross_Tech Light Load Member

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    I learn as I go too. That's what we're all here for!
     
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