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Then perhaps 'AZ Deuce', YOU are the guy that needs to volunteer with a little dirty knee time and let us know what is hooked to what and where!I use it all the time on my M931A1.
Great idea!!!
(pretty please!!)
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Then perhaps 'AZ Deuce', YOU are the guy that needs to volunteer with a little dirty knee time and let us know what is hooked to what and where!I use it all the time on my M931A1.
Great idea!!!
I will let you know when I get to it.Then perhaps 'AZ Deuce', YOU are the guy that needs to volunteer with a little dirty knee time and let us know what is hooked to what and where!
(pretty please!!)
We are in the process of doing a cab swap on a civilian truck. The truck is a tractor and the doner cab came from the same type of truck except it was a straight truck. There were so many subtle differences in the airbrake system that we ended up swapping the entire system from cab to cab. The main differences were the trolley valve, the trailer supply and parking brake valves, the tractor protection valve and a whole lot of subtle differences. There were even differences in how the foot valve was plumbed. The tractor had additional air pressure sensors.Appreciate that, but I want to learn more about air brakes - how they work and how to work on them. Other than the trolley brake and the 5th wheel gladhands, how to the air brakes on the tractors differ from the air brakes on the cargo trucks? Doesn't seem like it should be too difficult, swapping parts around. What am I missing?
That is what we thought when we did the cab swap. The donor was identical to the tractor except it was not a tractor.Well sure I can see how that would turn into a nightmare, but I'm talking about swapping parts between two versions of the same vehicle (M931A2 & M923A2).
The trolly valve handles all that. Think of it like a front axle engagement dash valve, but with infinite adjustment. The dash valve does the same thing but only has On/Off capability.Vid is good, thanks. I have one question: If hand trolley valve has exhaust port to bleed down pressure on brake service line when handle is up or in full off position, what would keep air pressure from going up through the hand valve exhaust when the regular foot valve is used?
I get that the check valve isolates the abs relay from hand valve pressure, but it seems like you would almost need one on the hand brake line to the rear also, but then how could the trailer brake service line pressure drain if the hand brake valve was used then released?
I can’t seem to solve these both at the same time. How does your hand valve not hiss air when your foot pedal is used?
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