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08-10-2022, 05:10 PM
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#1
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Member
Newmar Owners Club Spartan Chassis
Join Date: Sep 2011
Location: Covington, LA
Posts: 56
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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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08-10-2022, 05:32 PM
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#2
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Senior Member
Join Date: Jul 2014
Posts: 35,349
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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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08-10-2022, 05:39 PM
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#3
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Senior Member
Join Date: Oct 2014
Posts: 7,870
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Leak or bad pressure sensor-- you need to diagnose before driving any more!
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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08-10-2022, 06:15 PM
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#4
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,311
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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.
1-800-543-4277
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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08-12-2022, 06:55 PM
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#5
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,311
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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 .
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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08-13-2022, 10:30 AM
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#6
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Member
Newmar Owners Club Spartan Chassis
Join Date: Sep 2011
Location: Covington, LA
Posts: 56
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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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08-13-2022, 11:42 AM
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#7
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,311
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Quote:
Originally Posted by Hyatt Roadie
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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Thanks for the additional info , as mentioned by Brett , your issue is beginning to look more like a pressure sensor problem than a leak .
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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08-28-2022, 02:23 PM
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#8
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,655
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Quote:
Originally Posted by Skip426
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 .
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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.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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