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pressure building in oil hub

I have a Wabash dryvan trailer 2012, I noticed on one hub oil being forced out of the rubber plug on the sight glass, and when I pulled out the rubber stop I could hear air escaping. My question is , is there a vent on the hub that could be plugged, I checked the other axles no leaks and no air pressure in the hubs. Thanks

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No, there's no airline running through the hub, I checked the rubber plugs non are vented. Both answers do make sense though thanks

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I took plug out and cleaned it, it has stopped leaking . I do check hubs often they are not heating up. Thanks for all the suggestions

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Run a needle through the middle of the rubber plug so that the pressure will be released when it builds up....''italic text''

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Do you have air line coming from the hub to your tires? If you do it's probably leaking air & forcing the oil out.

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The rubber plug itself is the vent if its a vented plug. They make those rubber plugs vented and non vented.

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check the vent, i think is written somewhere that we are to clean and check the vent every circle check or once daily...lol

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after 2 or 3 hundred miles..stop..get out & check for heat..feel all 4 hubs..if that one is hotter..then bearings..if not..then not venting..do not use brakes to stop so brake heat doesn't make hubs hotter

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gndbuck will be eternally grateful.
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