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Thanks for your time! The diagram shows an o-ring around the main plunger. I'll bet that's the problem. I'll open it this weekend and see if I can figure it out. Thanks again!

That helps a lot. Thanks!!

This is the valve on the front air tank.

When I say "behind the front air tank", I mean towards the center of the truck. I can post a pic tonight when I get off of work. Thanks again.

Thank you so much for chiming in! I've been pouring over the forums and the TMs trying to figure this out but I can't find any mention of this valve. Unfortunately, the valve in your pic isn't the one. My leaky valve is right behind the front tank. You have to crawl under the truck and look...

Hey guys! This is my first time posting. I hope that I'm doing it right.... Anyway, I have an LMTV that has a loud air leak suddenly coming from a relief valve behind the front air tank. It doesn't do it until I release the parking brake. The front brakes then begin to drag and sometimes...

Hello folks! Been digging thru the TMs and posts to no avail. I have a 1098 with an odd air leak. Air pressure on both gauges is 120. After driving it tho, a loud air leak begins from a valve with an external rubber diaphragm which is located behind the front air tank. The front brakes then...