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Old 05-22-2020, 02:47 PM   #1
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Air system bleed down 45' tag

Hi I an just curious. How long does it take for your air system to bleed down?Not the suspension but the gauges on the dash. Air bags stay up for almost seems like weeks (hwh turned off) Dash gauges down to zero in 24-48 hours.

Any comments would be appreciated.

Thanks
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Old 05-22-2020, 04:31 PM   #2
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If it is like mine the system has PPVís Pressure Protection Valves. These protect the main tanks from being bleed down from auxiliary items such as steps,horns ect. This leaves the main tanks to take care of brakes. Mine set at about 62 psi. So if the suspension system is starting up but the tanks go to 0 then you have a leak on the tanks or brake system probability. Really need a air system diagram to chase the hard to find ones but I would start with soapy water and maybe you will be lucky
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Old 05-24-2020, 08:57 AM   #3
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Quote:
Originally Posted by jwlce View Post
Hi I an just curious. How long does it take for your air system to bleed down?Not the suspension but the gauges on the dash. Air bags stay up for almost seems like weeks (hwh turned off) Dash gauges down to zero in 24-48 hours.

Any comments would be appreciated.

Thanks
My '09 Allure suffers from the same issue. Must be a leak but TransWest gave up looking for it. I now think it's up to me and my soapy water bottle to patiently search for it. TransWest declared defeat and said it must be hidden inside along the frame rails and I'll need to remove the interior basement panels to find a bad hose There shouldn't be any fittings along those interior runs.
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Old 05-24-2020, 10:29 AM   #4
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On our coach inside along the frame are straight pex hoses bundled with other cables/hoses. No worry about them there.
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Old 05-24-2020, 10:33 AM   #5
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The air gauge on our rig stays afloat for about a week after shutting engine off, but knowing ours is 7 years elder.
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Old 05-25-2020, 06:24 AM   #6
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SO far I have found 2 leaks. Both related to the low mount turbo control valve. on the Cummins engine. The bigger leak was an o ring on the top fitting. Of note this was a green high temp o ring. The bottom of the control valve has an rotatable elbow fitting that I will be replacing. Apparently this thing gets a bit warm in its location. Will see what happens next.
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Old 05-25-2020, 02:04 PM   #7
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My tanks began going to zero this winter in about 5 hours. Prior to that my front bags would empty while stored.

The repair by NorCal Kenworth was to replace the front air leveling valve (Gillig Part).

Now my gauges drop to about 65 lbs in a couple of weeks and stay there while the rig remains level.

I mistakenly bought a Haldex 90555105 Leveling valve from Haldex that is reported to fix some CC rigs but is collecting dust on my shelf.......
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