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Old 08-18-2017, 11:32 AM   #1
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Bad air check valve or something?

2000 Newmar Dutchstar on Spartan chassis

Hereís what happened. One morning we are leaving Utah, I start the MH and let things air up. As pressure builds, I feel air going to the bags, but the brakes arenít coming up to pressure. I roll down the window and hear air whistling out of the system in the back driverís side that usually stops in 30 seconds, but doesnít this time. Iím thinking Iíve got a bad air leak in a bag.

I shut down and crawl under to see where it is coming from. Air it still leaking so the MH is dropping. I lift the back with the leveling jacks so I can fit under there and restart the engine to put air in the system again. This time everything works fine. I pull up the leveling jacks and no air leaking sounds and brakes are up to pressure. We drive all day with no problems.

At the next stop it happens again, so I follow the level jacks procedure used before and it works.

The last couple stops on the way home, I donít dump the airbags and donít have a problem airing up.

This leads me to believe that the problem is in some valve that diverts air from the bags to the brakes. Itís not closing unless the back of the MH is up. So its gravity helping or the fact the rear airbags are stretched.

Anyone seen something like this before? If so, what was happening?
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Old 08-18-2017, 02:54 PM   #2
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There can be several causes ; but first ; the air brake system gets priority , the air suspension is secondary . There will be a protection valve that should stop any air being supplied to the suspension in the event of an air bag blow out to keep at least 65 PSI for brake application .
The air suspension system should only be supplied air from one of the brake system tanks , but the leak may be large enough that the compressor cannot build pressure in the non leaking side of the system.
The air suspension " dump solenoid " may not be re-seating properly.
For proper info contact Spartan motor home support , with your serial number , and have them send you an air system diagram and any info you can get on component locations , like the dump solenoid .
Has the air system dryer been serviced lately?

1-800-543-4277
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Old 12-15-2017, 06:05 PM   #3
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Kind of what mine does about half the time after parking overnight and using revelers.
In the morning I start the coach and retract the revelers. The most air pressure that I'll get is just over 100. I can hear air escaping from the area of the rear axle. All I have to do is use the rear revelers and before the levelers have raised the rear a few inches, the leak stops and the air pressure goes to 115. I raise the revelers and drive off.
Unfortunately, I have no idea what causes this or what the fix is.
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Old 12-15-2017, 06:07 PM   #4
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Insert levelers where is state's revelers. Stupid spell check 🙄
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Old 12-15-2017, 06:46 PM   #5
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We still have not taken the MH to Spartan for service to figure out what the problem is. Might try to take it up to Michigan this spring.
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Old 12-15-2017, 07:18 PM   #6
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In the third poster case, I think your suspension ride height valves are traveling to far when dumped, opening the exhaust port. With them open, you are not getting pressure to the bags. Its going in the the valves and out the exhaust port.

When you raise the coach with the levelers, the chassis goes up and the axle stays put. That causes the suspension valves to move enough to block the exhaust ports and let the bags fill.

Once its at ride height, it never moves that much to cause the valve to move too far and all is well.

The way to check this is to ride up on ramps, high enough to get under it with the bags dumped. Then you can get under it to find the leak.

You can't use the jacks because once you lift it with the jacks, the problem goes away.

Its a theory but makes sense.
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Old 12-16-2017, 12:04 PM   #7
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I'll have to give that a try, twinboat. Thanks.
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Old 12-17-2017, 08:46 AM   #8
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X2 on the rear ride height valve. Pretty much same scenario on our coach year before last. The valve is not too expensive (ordered mine from Spartan) and the change over is not hard. I would have a truck repair shop do it as a SAFETY measure. You have air pressure and NO clearance under the coach with the air dumped. Double danger.
Ride Safe.
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Old 12-17-2017, 08:54 AM   #9
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Mine was doing all of what has been described above a couple of years ago, putting the rear jacks down would stop the air leak , but it totally failed at home one day. Ordered a new ride height valve from Spartan and installed ......problem fixed.
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