[Richard]

If you find the air controls leaking, they can be impossible to find for our era seats. I have successfully used pneumatic paddle valves that the airbagged car crowd uses to replace them. They are usually larger than the original, but some creativeness in mounting goes a long way.

[Fulltiming]

The lumbar controls on mine were leaking and unavailable. They held air but the control leaked on the input side so I installed a shut off valve in between the airline and the valve. No more leak and if I want to adjust the lumbar, I open up the valve, make the adjustment and close the valve again.

[rheavn]

The air leak job is complete!!!  Thanks to all the thread contributors who gave me fresh ideas as I moved along.  

The final air leak ended up being a loose fitting on the back of the emergency brake valve under the dashboard.  I was able to hear the leak using my ultra sonic leak detector.  

My entire air system is now air tight for the first time since I've owned the coach.  All "push in fittings" have been replaced.

The seat was found to be air tight, but I found two "push in fittings" that were replaced, so thanks for that suggestion.

In the past I have never gone about finding air leaks in an organized manner.  This time, by doing the system schematics, I was able to break the system into three separate systems.  This allowed me to find leaks or eliminate parts of each system part by part in an organized manner.  As I moved from the back of the coach forward I knew I was leaving no leaks behind.  

In case you plan on paying someone to find your air leaks, this project took me fifteen days.  The bonus was I learned a lot that I will not forget and have a better understanding of the air system.  I also have a complete set of schematics and complete documentation of what I did.  It will be an easier process in the future.

[bikestuff]

Steve,

Congrats on a job well done and a very impressive feat! You have certainly inspired me to start a quest in hunting and killing air leaks.

Can you recommend a source for the alternate fittings. I have quite a collection of the push type connectors but have not really understood the alternative. Can you share a link or two?

Thanks,
bill

[rheavn]

If you want a walk up counter NAPA or O'Reilly's usually has a good collection.  I live in the country so I just let Amazon deliver them to me.

http://www.amazon.com/s/ref=nb_sb_noss?u...n+fittings

http://www.napaonline.com/Catalog/Result...d3%26N%3d0

http://www.oreillyauto.com/site/c/search...n+fittings

A Google search for "brass dot air brake compression fittings" works too.

[Richard]

And my online source http://www.mcmaster.com/#compression-d.o...s/=10rz7b4

Not the cheapest, but usually at my door in one or two days, and always in stock.

[Land Yacht]

The item is in the right front basement compartment.  It is plumbed in with a 1/4" air line and the pressure switch for the 110V air compressor.  It has a slow leak coming from behind the large plastic nut.

What is it?

What is its function?

Where does the 1/4" line go?

Steve mine is doing the same thing, leaking at the large plastic nut. Did you replace the entire unit? If so, do you have the part number ?