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Old 10-20-2020, 08:36 PM   #1
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Suspension Loss of Air

on our 2014 Fleetwood Excursion 33D, I noticed that when parked for a few of days, the Air brake tanks losses pressure. They are normally 120psi when I park but a few day later, I find that they are less than 50-60 psi. Is this normal or there is something wrong with the tanks. We have this MH for just over a month.



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Old 10-20-2020, 08:39 PM   #2
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2005 meridian air bleeds down in a few days seems normal.
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Old 10-21-2020, 08:42 AM   #3
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I wouldn't worry about it... even on my 2020, the tanks bleed down after a day or so.

Now if they don't pump back up, then I would worry!
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Old 10-21-2020, 09:00 AM   #4
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Air loss over time is normal.
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Old 10-21-2020, 09:07 AM   #5
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Somewhere in the forums , or in info from Freightliner , there is a number for an acceptable rate of pressure loss, per min, I don't have access to the number; and I'd hesitate to quote it from memory; but if your loss is in days , your well within the range.
Overnight , you'd have a problem.

Has the suspension dropped , or just the tank pressure?
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Old 10-21-2020, 04:21 PM   #6
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Suspension Loss of Air

I presumed that the coach suspension dropped. I was worried and did not noticed if the suspension was raising, when I started the coach and the low air pressure was beeping. The compressor pump a little over 125 psi for both tanks. I drove the MH 2hours today to get a MIL light corrected ( SPN 5491 After treatment 1 Diesel Exhaust Fluid line Heater Relay FM14 voltage below normal or shorted to lower voltage.) I will check it for sure next time. Anyway, the tanks did not go lower than 125psi during the drive.


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Old 10-21-2020, 04:42 PM   #7
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Another thing for your consideration ; the air suspension , only gets air from one of the tanks , and is isolated from that tank by a " Brake Protection Valve "; once the pressure in the feed tank has dropped to 65 PSI , the BPT will shut , meaning if you have a suspension air bag blow out , you will still have air pressure to operate the brake system that operates from that tank.

So if both tanks are down equally , it's not the air suspension draining them.

Call your RV's chassis manufacturer , for an "air system diagram" , linked to your serial number , it's an important document to have.
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Old 10-21-2020, 08:30 PM   #8
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Suspension Loss of Air

Good to know Skip426, both tanks pressure goes down. I did look around the Air bag front and read if I can detect a lieak with no success. Thanks you


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Old 10-21-2020, 08:43 PM   #9
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If your brake air pressure drops to 65 psi or less you better find a parking spot quick, because your rear brakes will come on and prevent you from moving till fixed.
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