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Old 11-29-2016, 10:50 AM   #21
Join Date: Jul 2015
Location: Spokane, WA
Posts: 22
Year: 1997
Coachwork: AmTran/Gensis
Chassis: International
Engine: DT466
Rated Cap: 72
Thanks Rameses.

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Old 11-29-2016, 11:23 AM   #22
Bus Crazy
Join Date: Feb 2012
Location: Salt Lake City Utah
Posts: 1,635
Year: 2000
Chassis: Blue Bird
Engine: ISC 8.3
Are there any wires going into that thing? To me it looks like a solenoid valve. Wipe it clean and look for markings. Maybe remove it and cap the supply side, and perhaps the load side too, and see whether anything vital breaks. If it has failed it needs to come out anyway, and finding a replacement whether sooner or later will be easier with the part in hand. Rather than waiting until you notice what's broken with that removed, you could instead trace the air lines to find out immediately.
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Old 11-29-2016, 11:48 AM   #23
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Join Date: Oct 2016
Location: North Georgia right below Chattanooga TN
Posts: 26
Year: 1998
Chassis: Amtran RE T444E
Engine: 7.3
Rated Cap: 72
On my bus the item you pictured looks similar to the one that controlled the air for the crossing arm on the front of the bus. I don't know what else it controls but I had a line coming from the front of the bus connected to the crossing arm. I disconnected it on both ends and removed the line, no air comes out unless I press the button on the dash to extend the crossing arm I removed.
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Old 11-29-2016, 07:27 PM   #24
Bus Crazy
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Join Date: Oct 2015
Location: Spring Valley AZ
Posts: 1,343
Year: 2000
Coachwork: Bluebird
Engine: 5.9 Cummins
Rated Cap: 2 elderly children, 1 cat
In an effort to practice what I preach, I grabbed my spray bottle, removed the panel over the air door and sprayed away. I found 2 small leaks and rerouted an air line that was in jeopardy of being damaged.

The leaks were caused by no thread sealer and 2 fittings that were barely tight.
Don, Mary and Spooky the cat.
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Old 11-29-2016, 09:04 PM   #25
Bus Geek
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Join Date: Mar 2011
Location: Houston, Texas
Posts: 8,462
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
Gotta LOVE a cheap fix! Excellent!
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Old 11-30-2016, 02:52 AM   #26
Bus Crazy
Join Date: Jul 2011
Location: Winlcok, WA
Posts: 2,233
I am having a hard time trying to decide what that might be.

If it has a knob on it then it most definitely operates one of the air appliances, most probably the stop paddle/crossing arm.

If it doesn't have a knob on it I can't think right off the top of my head what it is supposed to be doing. I would remove it and block off the line to see what doesn't work any longer. It is obviously there to regulate something on the accessory tank (the third or fourth tank) since it stops leaking when the system gets to around 80 PSI.

If removing it is a problem I would follow the lines to see where they go. If you have an air horn that works off of a button instead of a pull chain it may be the valve to operate your air horn.

Regardless of what purpose it serves, you can't leave it there the way it is.

Good luck and keep us posted as to what purpose it serves.
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Old 11-30-2016, 01:44 PM   #27
Bus Geek
Join Date: May 2009
Location: Columbus Ohio
Posts: 19,007
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
alot of the busses have air operated stop signs.. at least the older ones.. if its a northern bus it may also have air shutters... air shutters can become such a nuisance that a knob is installed to turn them off...

possiubly air lines for an air-seat?

anything like that should be going through a protection valve that only lets air go down to 65-70 PSI before stopping the flow...

in fact every air accessory except the brakes shiould be behind a protector valve..

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air compressor, air dryer, leak

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