2026 Ford E-350 Chassis / Thor Four Winds 25Z motor coach; which only had about 800 miles on it! While driving north on I-81, the low tire pressure warning came on. So, I switched to the tire pressure screen and the outside left tire was dramatically loosing pressure from recommended 65 psi - dropping to around 30 psi within a few mile. We pulled of onto the shoulder, with only 3-4’ clearance of traffic. My wife and I found that the angled extension valve stem came unscrewed from straight connection on the rim and was loosing lots of air. I was able to hand tighten the angled extension, then with needle-nose pliers snug up the valve stem extension. I then was able to use a portable compressor to re-inflate the tire to spec and continue out trip. However, had we not recognized the dramatic tire pressure drop, I’m sure we would have had a blowout!
- NHTSA ID
- 11733842
- Incident
- Apr 21, 2026