Inexplainable Loss of air

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 1Logger1, Jan 26, 2026.

  1. 1Logger1

    1Logger1 Bobtail Member

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    Mar 12, 2025
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    So I had just left the mill after unloading my Redwood logs, heading back out to the forest. My dash lite up red and was screaming at me with its alarm. My pressure gauges on both the first and secondary tanks were at 60 lbs. After pulling to the side of the highway i set my brakes and throttled up. The gauges moved up in pressure and alarms turned off. I headed back out after doing a complete walk around check and found to leaks, hissing or noises that would point to the reason. I made the rest of the day without incident. What would have caused the issue.
     
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  3. xsetra

    xsetra Road Train Member

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    Aug 21, 2011
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    Ice in the system. When you set your brakes the drop in pressure allowed ice to flow out of a valve.
     
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  4. bad-luck

    bad-luck Road Train Member

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    Hard to diagnose with out being there. But sounds like a valve was stuck open. Could have been from dirt or ice. Keep an eye on it and running it.
     
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