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Old 06-30-2022, 06:36 AM   #1
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Bouncing down the road!

The other day I was pulling my 2002 Demon Ultrasport out of storage to fill the diesel tank before prices go up again. While on the entrance ramp to the freeway I started bouncing, so much so that I wasnít belted in I would have fallen out of my seat. Any ideas on the issue? Thanks.
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Old 06-30-2022, 06:58 AM   #2
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Quote:
Originally Posted by sashaver View Post
The other day I was pulling my 2002 Demon Ultrasport out of storage to fill the diesel tank before prices go up again. While on the entrance ramp to the freeway I started bouncing, so much so that I wasnít belted in I would have fallen out of my seat. Any ideas on the issue? Thanks.
I reckon you would have had to be there to diagnose the problem to see whether it was road or coach related.
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Old 06-30-2022, 07:07 AM   #3
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It could be the road coupled with the speed you were going, it could be the shocks are really bad or it could be something else. I would see if it happens on other stretches of road. If not, I would chalk it up to the road/speed combination. If it continues I would take a hard look at the shocks. Good luck.
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Old 06-30-2022, 07:19 AM   #4
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Were you at ride height on the Freightliner chassis? Or, perhaps an airbag valve was stuck open allowing the chassis to bounce on the suspension without the airbag support.

I know my MH will bounce and buck if I move before the bags are aired up - not sure about your make/model - just a thought...

Must have been nearly terrifying when it happened!
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Old 06-30-2022, 07:45 AM   #5
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Speed was maybe 30 MPH. Road was normal with a few bump. I suspect it was my airbags. I replaced the shocks a few years ago and can’t imagine they would go bad that quickly. I’ll have to find a place to take a look at the bags. I don’t think I’ll tackle that one myself.
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Old 06-30-2022, 10:36 AM   #6
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[QUOTE=sashaver;6230795]The other day I was pulling my 2002 Demon Ultrasport out of storage to fill the diesel tank before prices go up again. While on the entrance ramp to the freeway I started bouncing, so much so that I wasnít belted in I would have fallen out of my seat. Any ideas on the issue? Thanks.[

Where your air bags full?
Doesnít sound like it.
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Old 06-30-2022, 11:53 AM   #7
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First thing that occurs to me is that the air suspension had failed, dropping the front or rear end. A broken valve, burst air line, etc.
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Old 06-30-2022, 12:06 PM   #8
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Most likely an airbag issue as the others said but it's possible to "blow out" a shock absorber (aka "oscillation damper"). This is easy to spot 99% of the time by simply looking at the shacks. If you see a trail of oil or the entire shock is oil, you have a problem. It can happen to a brand new shock as well as an older one. Older shocks are more normally a slow leak failure though.

Losing just one front shock can have you bouncing like a trampoline. The second and still good one can only dampen the suspension up to a point all by itself. On the majority of vehicles you can even remove one of the rear shocks and be pressed to tell any difference back there in normal driving. Hence the focus on the front.
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Old 07-03-2022, 02:27 PM   #9
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If this is on a Freightliner chassis, check the front ride height control rod rubber bushings (especially the bottom one). There is a circular rubber bushing on each end of the control rod. The control rod is located directly behind the driver's side front tire. The front rod is about 8-10 inches or so long. The top of the rod connects to the ride height control valve lever that controls the flow of air in and out of the air bag. The bottom connects straight below to the lower front suspension. Each end of the control rod wraps around a rubber bushing at each end. The lower one often fails due to weathering and age as they get a lot of exposure driving down the road. I experienced the massive bouncing you mentioned when my lower bushing rotted away.

In my case I was unable to find a replacement rubber bushing for my 2006 Journey a coupe of years ago and the truck service center helping me made an entire new control road by cutting down a Mack Truck control rod to size. They come with sealed bearings at each end of the rod and it worked great. Just have to make sure that you get the distance between the two pivot points exactly the same as the original control rod so that ride height is maintained as required.
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Old 07-03-2022, 04:38 PM   #10
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It sounds like an air bag issue. I had those exact symptoms when the air bags were not inflating properly.
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Old 07-03-2022, 04:44 PM   #11
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Yup, get the RIDE HEIGHT specs from Freightliner (assuming that is the chassis you have) and VERIFY.
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Old 07-03-2022, 04:51 PM   #12
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Here is a photo of my installation.
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Old 07-04-2022, 10:17 AM   #13
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Ride height

Thanks for all the input. Iíll take a look at the ride height.
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Old 07-04-2022, 10:47 AM   #14
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Also check that the U joints haven't sustained damage , they're what was causing the bouncing by binding up and breaking loose .

If you were low on the air suspension , and the joints were binding ; your lucky you weren't picking up your drive shaft from the side of the road.
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