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Old 05-16-2022, 11:11 AM   #1
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Suspension Air

Just bought a 2004 National RV Tropical T350. First RV. I have attached a picture of a switch described as suspension air. What does this do? It has lower and auto as options. Looking at the manual there is something identified as air dump where this switch is located. Thoughts please. Thank you!
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Old 05-16-2022, 11:17 AM   #2
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A good question.


But suspect it is NOT original equipment. Likely installed by previous owner.


Hopefully, someone else will have run into that device.
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Old 05-16-2022, 01:35 PM   #3
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I have the same switch, it does as marked. Lower when camping prior to engaging levelers, air up (auto) prior to traveling.
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Old 05-16-2022, 01:36 PM   #4
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Originally Posted by hayward3411 View Post
I have the same switch, it does as marked. Lower when camping prior to engaging levelers, air up (auto) prior to traveling.

Interesting, as most jack and air leveling systems have air dump is the first step in their leveling procedure without the need for an extra switch.
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Old 05-16-2022, 02:59 PM   #5
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These switches are pretty common, here is a short video on their operation.
https://www.google.com/search?q=air+...client=gws-wiz
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Old 05-16-2022, 04:52 PM   #6
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Suspension Air

Your responses are appreciated. I got thrown a bit because the leveling instructions from the manual say to dump the air first using the dump switch but then I looked to find the dump switch which instead was labeled suspension air. Thanks for clearing this up.
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Old 05-24-2022, 02:23 PM   #7
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Some National motorhomes don’t have that switch and some do according to the National options! I’m the administrator for National RV Motorhome Owners group on Facebook check us out!!
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Old 05-24-2022, 03:35 PM   #8
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Hello! I have that same switch in my 2000 National Tradewinds. You are correct it is the air dump. Auto for driving and parked/camping put in lower position. Let Jack's down after the coach has fully lowered. Happy Camping!!!
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Old 05-24-2022, 04:13 PM   #9
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Switch is original. Used to dump the airbags before using level Jack's. Controls the air ride suspension. Do not drive unless in auto position. Can do damage.
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Old 05-24-2022, 07:34 PM   #10
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air switch.

Quote:
Originally Posted by TVdeacon View Post
Switch is original. Used to dump the airbags before using level Jack's. Controls the air ride suspension. Do not drive unless in auto position. Can do damage.
Yes Lower=dump
Yes: Driving with air bags dumped may pinch the air bag and cut it, but what really happens is that, inside the air bag, there is a hard rubber bumper that the suspension sits down on when dumped. Driving while sitting on the bumpers bangs them hard enough that it can break off chunks of hard rubber. These rubber shards rattling around in there will cut the bag. Common failure on highway trucks.
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