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Front Bags Losing Pressure
I finally had a chance to check. I found a couple of leaks in the front 6-pack where the cylinders and the manifold join. How are these tightened? It looks like 2 on the bottom are the only ones leaking.
1999 Coach 513
those 6 solenoid valve bodies are threaded into the aluminum manifold. they can be carefully tightened with a channel lock. helps to take the coils off. the nut on the stem just holds the coil on. it slides off once you take the nut off.

however, if it was me, i would take the valve body off and clean it, clean the manifold and put at the very least new o rings on it. it takes two.

i will send you my phone number. call me if you would like

2002 45'8" Newell Coach 608  Series 60 DDEC4/Allison World 6 Speed HD4000MH

I had a very similar problem as David & Teresa.  Overnight my coach would drop equally on both sides down to the stops.  The difference was that my coach supply pressure would also drop to zero.  The rear didn't drop at all.

Using a spray bottle I found an air leak on the left front air spring connection.  This corrected the left front dropping.  I then found an air leak on the right travel valve on the front six pack.  Replaced the two o rings and now all is good with the right front.  The supply air pressure now stays up.  Problem solved.  Lesson learned is when you are chasing an air leak, never assume there is only one!
Steve Bare
1999 Newell 2 slide #531

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