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Old 08-15-2009, 06:34 PM   #1
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Air ride questions for a M-2 Freightliner chassis

My new to me 05 Dynaquest has rear air suspension, air seats but no air brakes. Sitting
at a stop the air psi gauge holds pretty steady, does not cycle. But when going
down the road the gauge rapidly drops to 100 psi and then recharges and pops off
at 150 psi. Maybe once a minute or so. Is this normal? The popping noise really gets my attention.

Thanks, Bill

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Old 08-16-2009, 05:37 AM   #2
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Bill, welcome to iRV2.com. We are glad to have you join us here and we look forward to reading of your adventures and experiences. I am sure you will enjoy this website.
The road is probably causing the air ride valves to release air on the high side of the suspension as you travel and the compressor will cycle on and off to re-pressurize the tank(s). I am surprised that you can hear the pop off of the regulator or filter drier as you are driving. As long as the coach is not having a problem such as listing or dropping ride height I guess you are operating as per design.

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Old 08-16-2009, 08:45 AM   #3
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Hi Bill and welcome to IRV2.

It seems odd to me that the pressure drops that quickly and cycles so often, and that you can actually hear the valve pop while driving down the road. I suspect a suspension leak in some thing that gets activated in response to shifts in weight as you drive. We had a problem for awhile in an XC chassis where the valves popped and air pumped repeatedly when the coach leaned to the right or the nose went down while braking. Turned out something in the ride height control was leaking.

I'd get in touch with Freightliner Customer Service and ask. They will likely say "take it to a dealer for a check up", though.
Gary Brinck
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Homebase in the Ocala Nat'l Forest near Ocala, FL
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Old 08-18-2009, 11:11 PM   #4
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I spoke to another owner of a coach like mine and his does the same, It's not to bad on a smooth road, He explained that the air release is caused by the suspension adjusting
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