How to check tire pressure on autofil tires w/o the tap...

Discussion in 'Questions From New Drivers' started by Qbf594, Jan 22, 2021.

  1. Qbf594

    Qbf594 Road Train Member

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    And is it possible for 1 axle to be different than the other? Are they isolated?
     
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  3. 062

    062 Road Train Member

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    As far as checking the pressure. You can pull a line off at the hub if you see what looks like a valve stem check it just like a tire. If not you’ll have to take the line off at the wheel.
    You can have different pressure on a set of duals. I picked up a bolt on a outside tire and the inside didn’t lose air.
     
  4. Cattleman84

    Cattleman84 Road Train Member

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    Just unscrew one end of the autofill line then check pressure as normal.
     
  5. Qbf594

    Qbf594 Road Train Member

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    The hub has 2 knurled fittings at 180°. If I unscrew one the hose has the place I can put the air gauge on but that's measuring the pressure coming out of the tire. There's no way to measure what's coming out of the hub.
    And the tire is low....
    Guess when suns up I'll go poke around a bit and see what I can find...
     
  6. Cattleman84

    Cattleman84 Road Train Member

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    How low is the tire... Like 5 to 10 pounds low... Or like 20 to 30 pounds low??? How long has the trailer been sitting since it last moved.
     
  7. 062

    062 Road Train Member

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    There’s a valve under the trailer that supplies air to the system. Make sure it’s open.
    Take a line off at the wheel and see if it’s the same as at the hub.
     
  8. Qbf594

    Qbf594 Road Train Member

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    Like 65 or 70. I only checked 1. I'm kinda under the gun for a couple days... Maybe when Tuesday gets here...unless im in a snow bank...
     
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