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Air bag question
When leveling with air bags how long should they stay inflated (level) on older coach bus? Been looking at a couple, one owner said the bags stay inflated 3 days (which “is exceptional”) other owner said only 1 day. I was thinking they should stay inflated until I deflate. I know this is a newby question.
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8 Replies
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I think the Prevost standard is 3 days. Jon will chime in if that is not correct.
After new Norgren valves and air bags I still leaked down over a day. My coach has the “reverse logic” which means the Tag Axle brake interlock R-12 pilot air is the tag bag air. Once I replaced the R-12 (keeps the tag brakes from working when the tag is raised) values I have no leaks.
Mine will stay up for weeks. I far cry from when I bought it. It would drop an inch overnight.
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Don’t know about others, but mine will stay for weeks.
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Mine never moves.
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Joe Dan and Tom
Thanks for the replies. Very helpful knowlege as I search for my Prevost.
Ron
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When we first picked up the coach, it took 3 minutes for the front bags to deflate. After replacing the Norgrens air bags etc, it stay up for weeks.
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Our coach just sat for seven weeks (albeit warm weather) and I don’t think it dropped a quarter inch. When we bought it three years ago it would start falling to one side or the other in a couple of hours. Jeff Rowe fixed that problem.
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If a coach is leaking down and leaning or dropping and Prevost fixes it their standard has been that if it remains in one position after parking for 3 days it meets their standards.
As can be seen from the posts above if the system is tight the coach can remain as it was for a long time.
If the concern about how long a coach can remain in a given position is related to a coach purchase, I would not make that a deal breaker for a couple of reasons. First, at any given time a coach with an otherwise superb service history can start to show leaks in the suspension. There are a number of potential locations for leaks and the reasons for them can range from a minor issue with a valve or fitting, to a suspension system that just needs to have the air bags and valves replaced.
Second, if there is a concern about a coach that might be leaning or dropping the repair can be quantified. New air bags, new compression fittings, and new Norgren valves cure the problem. The cost is less than $2000 in parts and about 2 days labor so if you really like the coach you and the seller can negotiate who eats the cost.
The same philosophy can be used when considering any coach, Any issues or concerns discovered during a pre-purchase inspection can become part of the negotiations relating to purchase price. The big concern should be if the coach has a good maintenance history, and if it shows a lot of deferred maintenance that is when there should be caution because bringing a coach up to date when little has been done previously can get expensive.
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About March 1 Jeff replaced I believe an R12 or 14 in the front, and gave it a shot of viagra. It’s been in the full up position since April 1. The party’s over 8/16 though as we come down to road height for the run to Driggs. Oh what a life.
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