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Old 10-25-2021, 07:57 PM   #1
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Air Bag suspension leak

I have a 2000 Harney Coach, Has 4 new air bags as of last year. I have crawled all over this coach and I can not find the reason the air bags will not hold air for over 8-10 hours. Checked every line and fitting and no sign of air leak.
Maybe this is normal, but it used to hold air a lot longer up to 24 hours.
Am i looking for a problem that doesn't exist? I read another post on this subject awhile ago, but can't find it.
All ideas are welcome!
Thanks
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Old 10-25-2021, 08:14 PM   #2
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Is this recent or did it start when the air bags were changed? Do all go down or just one?
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Old 10-25-2021, 08:20 PM   #3
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It has been going on for awhile. I am just trying to figure out why. The air bags all seem to be going down the same amount and after about 6-8 hours the dash air gauge show O air pressure;
Thanks for you input
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Old 10-25-2021, 09:02 PM   #4
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Have you checked the height control valves? They can leak from their bodies or stems.
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Old 10-25-2021, 09:05 PM   #5
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If your gages are reading 0 also then you have some leaks at or before the pressure protection valves. Need to get that addressed first, normally they would not allow the tanks to drop below 60-65psi. Then you can start looking for leaks in rest of system.
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Old 10-26-2021, 05:35 AM   #6
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Soapy water in a spray bottle and a good light are a big help. Anything can leak, not just fittings. Tanks rust, make sure lines aren't rubbing anything. The pressure protection valve isolates the brakes from the rest of the system. Start at the compressor and follow the lines.



https://bisonfleet.net/rv/RV-brakes.html
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Old 10-26-2021, 07:25 AM   #7
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Quote:
Originally Posted by busyguy View Post
I have a 2000 Harney Coach, Has 4 new air bags as of last year. I have crawled all over this coach and I can not find the reason the air bags will not hold air for over 8-10 hours. Checked every line and fitting and no sign of air leak.

Maybe this is normal, but it used to hold air a lot longer up to 24 hours.

Am i looking for a problem that doesn't exist? I read another post on this subject awhile ago, but can't find it.

All ideas are welcome!

Thanks


How are you checking air lines? A spray bottle and kids bubbles do good on fitting.
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Old 10-26-2021, 08:44 AM   #8
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air Bags

Thanks you all for your thoughts and input.
I am using Bubbles in a spray bottle. Shows no leaks. I only have air to the bags, do not have air brakes. I have checked the height control valve's and no leaks. This is not a big problem now as I am not using the coach. I just like to keep it in a ready to go condition.
Will keep checking. I also checked the tank and seems good. There is no rust under my coach as it has always been in Texas and Georgia.
Thanks
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Old 10-26-2021, 09:24 PM   #9
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Quote:
Originally Posted by busyguy View Post
Thanks you all for your thoughts and input.
I am using Bubbles in a spray bottle. Shows no leaks. I only have air to the bags, do not have air brakes. I have checked the height control valve's and no leaks. This is not a big problem now as I am not using the coach. I just like to keep it in a ready to go condition.
Will keep checking. I also checked the tank and seems good. There is no rust under my coach as it has always been in Texas and Georgia.
Thanks
Perhaps the one-way valve after the air compressor is leaking. This cannot be detected with bubble spray.
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Old 10-26-2021, 11:02 PM   #10
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Owners posted leaks at air dryer body.
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Old 10-27-2021, 09:43 AM   #11
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My coach does not have an air dryer. Will check the one way valve if I can find it.
Thanks for all the input. Will post an update when I find the problem!
Busyguy
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