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Old 08-17-2016, 07:08 AM   #21
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I only say put it on stands to better be able to level it... but no I see the air ride just sits on the stops when flat.. my bus loses its air as noted above so its on the stops most anytime its parked..

-Christopher
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Old 12-14-2016, 01:39 PM   #22
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About the rear air ride suspension............................

Is there a means of more air pressure being added as the loading inside the bus increases?

So that nothing makes contact with things they should not, like bump stops and tires hitting wheel wells, etc. ?
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Old 12-14-2016, 02:25 PM   #23
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Even if the air ride goes completely flat you won't have to worry about anything rubbing that shouldn't because there is a mechanical stop to prevent it from going down past a certain point.
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Old 12-14-2016, 02:36 PM   #24
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most of them are pretty simple.. you can adjust the height that it sits.. if you set ot to a higher height it will have to keep higher pressure as you load it.. or I should say higher in relation to if you leave the height at its current setting.. makingthe ride much stiffer.. if your bus is sagging when you lod it down then the air ride is not working as it should. most of the are a simple lever-arm from the suspension to the bus frame to hold a height.. its a simple air valve connected to the lever arm....

there are published specs in the service manuals for what its recommended setting is.. too high setting and the ride is way stiff and increases the chances of wheel bounce over bumps... too low and the suspension is softer and more likely to bottom out on bumps...
-Christopher
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Old 12-14-2016, 02:37 PM   #25
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N/A

I am looking to find out if more air pressure is added to maintain a certain ride height, automatically.

When loaded with cargo versus not loaded.
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Old 12-14-2016, 02:40 PM   #26
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Thanks cad,
I was thinking there was some sort of "ride height maintainer valve or regulator" somewhere.
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Old 12-14-2016, 02:42 PM   #27
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yes.. thats the valve I mentioned..its at the back of the bus and is a simple lever arm attached to the suspension and the bus frame.. it simply maintains height.. whatever load is applied in the bus.. if the rear lowers down then more air is added to maintain that height .. its typically all mechanical, no electricals.
-Christopher
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Old 12-18-2016, 09:08 AM   #28
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Quote:
Originally Posted by cadillackid View Post
yes.. thats the valve I mentioned..its at the back of the bus and is a simple lever arm attached to the suspension and the bus frame.. it simply maintains height.. whatever load is applied in the bus.. if the rear lowers down then more air is added to maintain that height .. its typically all mechanical, no electricals.
-Christopher
My suburban uses a very similar setup, as did the limousine... Put 10 people back there for about 20 minutes, then have them all get out. The bumper was about 8 inches higher, till it balanced out.
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Old 12-18-2016, 10:33 AM   #29
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Yea, way back in 1988 I ordered a brand new Jeep pickup.
Then I promptly replaced the rear axle with a Ford nine inch.

It had a valve with a lever on the body with a rod going down to the axle.
It was a brake bias balancing valve so that with no cargo, the brakes were restricted. And with more cargo the valve opened for more braking.

I guess it was a type of mechanical anti-lock brake system.

Off subject but that is what came to mind with the air ride system mentioned.
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Old 12-18-2016, 03:34 PM   #30
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Safety issue...your air tanks should not go empty because of leaking air suspension. There is a "pressure protection valve" on an air tank that supplies the "height control valve". This valve is important because it "protects" the pressure in your air system from being depleted lower than 70/80/90 pounds or so. That way if you have an air ride system problem (blown bag, major leak, etc) your air system is "protected" so that you still have brakes...really important!!

Here is how to check if your pressure protection valve works...disconnect the air line that supplies your height control valve....the air should leak down to no less than about 70 psi on one or more of your air tanks.

If the air comes out and then stops and you still have at least 70psi in the tank, your pressure protection valve works. If your air leaks out until your air tank is damn near empty, you need a new pressure protection valve.

You can Google pressure protection valve or Sealco 140270, 140280 or 140290...the last two number of each part number is the psi rating at which this valve shuts off.
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