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<p>[QUOTE=&quot;86scotty, post: 12275693, member: 203295&quot;]I&#039;ve had an occasional problem for awhile with my airbags and sliding tandem not working all the time, slow to build pressure.&nbsp; I replaced pressure protection valve and leveling valve in trailer today but still have a problem.&nbsp; I am getting pressure to everything in the trailer but not enough for everything to work reliably.</p><p><br /></p><p>Any idea what the pressure coming from the airlines at glad hands should be?&nbsp; I&#039;m going to rig up a gauge to a glad hand tomorrow morning and test what I&#039;ve got.</p><p><br /></p><p>I&#039;m thinking the big valve on the firewall may be bad.&nbsp; I don&#039;t know what it&#039;s called.&nbsp; Has big green and red lines coming out of it, the green one goes straight under cab to trailer air line manifold at back wall.&nbsp; I&#039;m thinking it&#039;s bad because if I supply air to the trailer and pull my red air line it just hisses, it does not pop closed on the dash as it should.[/QUOTE]</p><p><br /></p>

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