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Old 12-13-2006, 08:08 PM   #11
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Les: I don't understand the "plastic fingers", but... Have you driven this thing yet? That yellow button sounds an awful lot like the parking brake to me. Pull to set brakes, push to release. If you are new to air brakes, it can indeed seem like a mystery.
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Old 12-14-2006, 11:33 PM   #12
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Hey guys,

Thanks for the good thoughts! In this case I do know it's not the parking brake; I've driven the bus quite a few times, my Blue Bird has air brakes and I'm an ex over-the-road Owner-Operator. The parking brake air valve is up on the dash to the left of the steeing wheel; what can I say...it's a left-handed bus...even the shifter for the Allison is on the left! The gizmo I'm talking about is to the right of the driver on a vertical panel that goes to the floor under the dash level (just below knee level). It's yellow (and much smaller than the brake air valve) and says "push-on, pull-off". It has air lines connected to the back of it. As for the "fingers"...around the valve, like surrounding the yellow knob part, is a plastic "cage" so to speak made up of these fingerlike pieces. I'll see if I can't get a photo of it and post it here. It is an on-off air valve; I just can't figure out what it controls as all the lines for it run inside the front dash area but regardless of whether it's on or off the air wipers work, the air horn works, the doors work the same, the air throttle (seemingly) does the same thing...just has me curious is all.
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Old 12-14-2006, 11:48 PM   #13
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Quote:
Originally Posted by jsham
Like the last poster said, that on-off switch sure does sound like a park brake switch.

When my air system is pressurized, it is nearly impossible to open the door by pushing on it.

I think the next thing I'd try is to test the pressure going to the cylinder. First, before you do any work on your air system make sure the tanks are depressurized! A 1/4" hose with 120 psi will leave quite a mark if it comes loose and gets you! Next, I'd buy a pressure gauge with a 1/8" NPT fitting. Unscrew the hose where it connects to the cylinder, connect it to the pressure gage, repressurize the system and run your open & close switch while noting the pressures. Also watch the gage for a little while and see if the needle moves, showing a pressure loss somewhere.

You may not want to do all that mess, but after doing that, you may be able to diagnose the system a little better. Or maybe you have messed around with things enough already to know that this would be a waste of time.

-Jeff
Hi Jeff,

Thanks for all the good info...much appreciated.

The pressure gauge test would be worthwhile. If I am getting full pressure at the acutator then perhaps the seal (or whatever it is inside) that separates the close side from the open side is letting air past. If I'm not getting full pressure then I can start chasing down the air line to see why not.

I'd rather use the doors as they are for a while before I tackle putting in a regular swing door. If I can get them to close tightly and seal I may just keep them as is...the air doors are pretty cool!
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Old 12-15-2006, 12:01 AM   #14
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Oh no, another old trucker! I still drive part time -- for Hendrickson out of Sacramento.

Boy, that little yellow button has me stumped also. Perhaps it was for some kind of school pupil transporting equipment, like a stop sign. My "Millicent" had a fold-out stop sign on the left, and a crossing bar (I don't know what they actually call it) on the front bumper, both operated by air. The school district probably disabled that equipment before they sold the bus.
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Old 12-15-2006, 12:10 AM   #15
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Quote:
Originally Posted by Elliot Naess
Oh no, another old trucker! I still drive part time -- for Hendrickson out of Sacramento.

Boy, that little yellow button has me stumped also. Perhaps it was for some kind of school pupil transporting equipment, like a stop sign. My "Millicent" had a fold-out stop sign on the left, and a crossing bar (I don't know what they actually call it) on the front bumper, both operated by air. The school district probably disabled that equipment before they sold the bus.
Ya know...that's a darn good idea. When I picked up my bus the stop sign arm was already removed. There's a good chance that valve might have been a way to keep it from swinging out when it wasn't appropriate. Now I'll have to trace that doggone air line to see where it goes!

Old trucker indeed...I'm not a day over *&! You know they say old truckers never die, they just get a new (ummm...truck!).
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Old 12-15-2006, 12:49 AM   #16
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Old 12-15-2006, 01:19 AM   #17
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Did the bus used to have automatic tire chains? I can't think of anything else.
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Old 12-18-2006, 07:18 PM   #18
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Quote:
Originally Posted by Elliot Naess
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Holy Mackeral! Now that's a beautiful rig! (I'm drooling on my keyboard!) Looks like a Prevost bus body mounted behind the cab...someone did one heck of a job.

[And yup...it's a Peterbilt! ]
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Old 12-18-2006, 07:23 PM   #19
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Quote:
Originally Posted by the_experience03
Did the bus used to have automatic tire chains? I can't think of anything else.
No chains but it does have wheel sanders. There's a vertical on/on switch for them and I assumed that they're electric but I haven't chased that down yet...another good thought. At the very top of the photo below just left of center you can see the bottom of the sander switch.

The yellow gizmo in the ceter is the thing I've been asking about; you can see the "fingers" around the center of the switch. The outer ring is the one that pulls up and pushes down; the center is fixed.

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Old 12-18-2006, 09:03 PM   #20
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it sure looks like the adjustment knob on an air pressure regulator the lower ring pulls up to lock it in place. what on the buss uses adjustable air pressure? doors, sanders, ?
Look in the graingers or mcmaster carr catalog at their air regulators and it will become clear as mud.
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