95 Dynasty Front Air Bag replacement

[jimwrye]

Two issues,...
Twice now I've taken off from an overnight stop and noticed an extremely rough ride. After pulling over, I found all four front air bags deflated. Dash air pressure reads 125/130 psi and I can't hear any leaks, motor running or not. My lady hears a slight hiss coming from the step cover slide area. (??)
I have one air bag (LFR) that looks old and scheduled for replacement, but here's the thing,...
After head scratching for an hour or so, (and calling roadside assistance), both times I've restarted the engine and after a few minutes, the bags started inflating.
Now, after the last deflation/inflation, I've driven about 50 miles to an RV park and have been sitting here for over a week, hydro-leveled and the bags are still inflated. Anybody out there ever had this issue???

My new airbag should arrive soon and I'm going to replace it here. I feel like I need to do something before moving on.

Would sure be nice to have some replacement guidence and an air system schematic for troubleshooting.
Any help would be appreciated.
Jim
95 Dynasty, 40'

[Vanwill]

Jim, I would think someone more knowledgeable than me would have chimed in by now, but I will tell you what little I know.

I think that if all four of your bags were deflated, it is most likely that you have a failing ride height valve, and replacing it is MUCH simpler than replacing an air bag. Not to say that you are not correct in replacing the bag, but they tend to fail slowly, and the coach's air compressor can usually keep up with the initial leak. When I am faced with a problem for which the cause is not clear, I tend to replace the cheapest/easiest component first. Since your pressure gage shows that your supply pressure is OK, I think your problem is not primarily due to a single air bag.

[Papa_Jim]

I think Van has 'hit the nail on the head' on this one.

Probably your front ride height valve is sticking. It's easy to find. Look at the middle of your front axle. You'll see a thin rod connected to the front axle and standing up several inches, connecting to the ride height valve mounted on the coach frame.

The valve may be sticking, or the connector ends on the thin rod may have slipped, or the bolt connecting the rod connector to the ride height valve arm may be rusted, causing the mechanism to stick.

If the ride height valve is OK, then there's another possibility, although it is not a common problem. The ride height valve receives it's air from a pressure control valve that's screwed into the front air tank. I think, but am not certain about this, that this pressure control valve maintains about 60psi to the air bags. If that control valve is sticking, the air supply could be intermittent to the ride height control valve.

Jim

[jimwrye]

Thanks for the help guys .I'll be checking this stuff as soon as the air bag arrives and I;m crawling around unde the rig.
Does anyone know if Monaco published an air schematic for the 95 Dynasty?

Thanks, Jim

[Twomed]

Crawl safely, and with a properly supported chassis.

Also consider a walkaround, after starting engine, and before taking off. On some rigs it is easy to damage the fiberglass wheel surrounds when turning if the bags are not properly inflated, also hard on the driveline.