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That's what I thought too, but I could hear air coming from this dump valve, and when I removed it I saw rust flakes & corrosion inside that were allowing air to escape (preventing proper operation). After removal, the tire stays inflated, and I had just cleaned/serviced the wheel turret as...

In short I have rebuilt/serviced every CTIS part except for the 3 Safety Relief Valves that mount between each pair of tires side-to-side...I had the CTIS working briefly after cleaning up the pressure transducer, then the left front tire started going flat. I quickly aired it back up manually...

A2 CTIS TMs (TM 9-2320-272-34P) Question While troubleshooting my CTIS system on my M931A2 and trying to find part numbers for possible replacement parts, I noticed that the -34P in the TM section of this forum is dated 1988 and only covers M939/M939A1 trucks...while doing a search of the...