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Old 08-10-2022, 05:10 PM   #1
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2005 Spartan K2 Chassis Rear Air Tank Pressure Drop

While driving home this morning from a weekend trip, the red light on the dash gauge for the rear air tank and the alarm came on at which time I noticed that the air pressure in that tank had dropped from the usual 120+ psi to 65. The brakes worked fine, so I continued my drive home of about 55 miles, but the rear tank pressure remained at 65 as did the red light and the loud alarm. I checked the brakes frequently to make sure there was no diminished function, which again, seemed to work fine as usual. The front air tank maintained the usual 120+ psi with no issue. I think there is a valve which regulates the air pressure in each tank. I am thinking that the valve malfunctioned, but there could be other causes for the air pressure drop in the rear tank and I am hoping for some helpful input as to what the problem could be. To be honest, I have to admit that I have not bled the tanks or changed the air dryer filter in several years. Many thanks to all.
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Old 08-10-2022, 05:32 PM   #2
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You have a leak, more likely in the ride height system or some other accessory.

They have pressure protection valves that stop the flow at about 60 psi, saving it for the brakes.
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Old 08-10-2022, 05:39 PM   #3
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Leak or bad pressure sensor-- you need to diagnose before driving any more!
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Old 08-10-2022, 06:15 PM   #4
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Did the coach settle as if you'd dumped to level as soon as the engine was shut off ?

You need to talk to Spartan Motorhome Support and get air system diagrams for your coach, have your chassis serial number handy when you call .
Make sure you get the whole air system ; brakes and suspension ; two separate sheets of diagrams in the 2001 info I have .
The diagrams will also show if your tanks are equipped with auto ejectors instead of manual lanyards for water drain.

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Old 08-12-2022, 06:55 PM   #5
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Just in case these pdf's are of any help at all I'll post them here .

Please note the issue dates, as newer chassis might have entirely different ; BUT: if the brake system diagram you received is similar the suspension diagram may be of some use .
Attached Files
File Type: pdf Spartan Chassis Air System elec gauges.pdf (222.1 KB, 10 views)
File Type: pdf Spartan Chassis suspension Air System.pdf (159.0 KB, 10 views)
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Old 08-13-2022, 10:30 AM   #6
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By the way, the coach did not settle as though I had dumped to level when the engine was shut off. I did not drop the jacks. The unit remained and has remained at ride height.
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Old 08-13-2022, 11:42 AM   #7
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Quote:
Originally Posted by Hyatt Roadie View Post
By the way, the coach did not settle as though I had dumped to level when the engine was shut off. I did not drop the jacks. The unit remained and has remained at ride height.
Thanks for the additional info , as mentioned by Brett , your issue is beginning to look more like a pressure sensor problem than a leak .
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Old 08-28-2022, 02:23 PM   #8
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Quote:
Originally Posted by Skip426 View Post
Just in case these pdf's are of any help at all I'll post them here .

Please note the issue dates, as newer chassis might have entirely different ; BUT: if the brake system diagram you received is similar the suspension diagram may be of some use .
Skip, a side note to the spartan air system diagram. The rear ping tank is in front of the rear axle on my chassis. It does not have a manual-cable drain valve; instead it has a radiator petcock drain. When I bought this MH I found the unlabeled drain that is not anywhere in the manuals, slightly opened it and drained out perhaps a teacup of water.
That was cause for me to rebuild the air dryer, I'd already pulled the #1 and #2 tank drains and got no water.
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