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<p>[QUOTE=&quot;Metalicious, post: 12279598, member: 171053&quot;]Pass through valve? I had a similar issue. Could hear air hissing under hood sometimes, would hear it in the tube that runs under the cab. One time the brakes didn&#039;t wanna release on the trailer I&#039;m assuming, but that was only once before I had the pass through valve on the firewall replaced. My shop I go to charged me I think $213 for the part, have to look to see what they charged for labor. </p><p><br /></p><p>I could hear air through the valves on the dash though, for a short while after starting the day then it would go away. Now I only hear it long enough to charge trailer tank and no more air noise.[/QUOTE]</p><p><br /></p>

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