And here is the bit you left out about TPVs. I see why you omitted that now. You're wrong yet again.
https://www.fmcsa.dot.gov/regulations/title49/section/393.43
https://www.fmcsa.dot.gov/regulations/title49/section/393.43
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Airbrake hand controller 'Trolley valve' install assistance needed.
- Thread starter zebedee
- Start date
jimbo66348
Member
The " used in commerce clause is a gray area when the cop states the law where any vehicle over 26,001 lbs. is a commercial vehicle. I humbly stand corrected on the personal use for recreation clause. I was fully aware of the farmer exemption, and the not highway speed exemption, but not the personal use one.
jimbo66348
Member
It says tpv or similar device. Same thing. Different name. It's any automatic device that kills the air to the gladhands, if there's a loss of air to the trailer. Try again.
jimbo66348
Member
Gladhands can separate, and the lines can blow. This will cause the trailer brakes to lock, and will cause loss of braking and control for the truck. Not a safe situation for anybody. My rims are not stamped, either.
Attachments
That would only really apply to M54 and M809 series trucks which would have a limited breaking with no air. The M939 series trucks have spring breaks so loss of air will apply the spring brakes. You won't be careening down the highway with no breaking ability.
The fact of the matter is these are not commercial vehicles and where never intended to be. If you want to come here and argue with everyone your time here will be limited. Everyone on here is pretty aware of what these trucks can and can't do. If you want to commercially drive something, an old military truck is probably not the best choice. If you want to comb through every page of the law and debate it until everyone is pissed off then why don't we just start talking about politics next. I think it's time to move on from this.
Find a way to contribute in a helpful and non-argumentative way or just sit back quietly and watch.
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Not true. You losing a rear emergency gladhand will not cause a decrease of air pressure on the truck side in a 939 series truck. Primary,secondary, and spring tank all have check valves that prevent backflow. The emergency side of the gladhands is charged off the wet tank which as we know is before the other tanks so they would retain air.
The point was more that the M939 series are equipped with spring brakes so in the event of no air the mechanical spring brakes apply. I can't think of any situation in the M939 series where you wouldn't have breaks unless someone caged the brakes. That is one of the biggest benefits of the newer trucks over the older m809, M39 and even the deuce.
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74M35A2
Well-known member
I can. If they push the “Spring Brake Override”, then lost air, she’s a runaway train. Rare situation to happen though. It is scary how many people don’t understand what that dash valve does on the M939xx’s. Would be better if not there, or labeled “Spring Emergency/Parking Brake Disable”.
I lost air by driving into snowbanks for fun, knocked my gladhand cover off.
I lost air by driving into snowbanks for fun, knocked my gladhand cover off.
What happened to me Driving a bob tail truck weighing 42.000 with s cam brakes at about 55mph and drove over a piece of rug or carpet it wrapped around the drive line braking a u joint the drive line hit the ground and both air tanks and one fuel tank loosing all air the engine was not running when I did get stopped just over a mile I remember the mile markers when walking back to get the drive line and air tank out of the road diesel was every where the brakes hot and smoking . I told this because at speed air brakes don't just lock speed and weight effects them in this kind of stop.
jimbo66348
Member
Thank GOD, nobody was hurt. Anything can happen on the road.