Air leak from one tank on 1998 Patriot

[Carl Boger]

I have a air leak on the tank that corresponds to the green needle on the air gauge.  The orange gauge seems to hold air for several days, but the green will leak out overnight.  Does anyone know what air accessories are supplied by the green gauge?
I have crawled around under the MH spraying the air line connections I could get to without taking to many things apart. 

So is there a way to narrow down where to look.  I think the air bags and air leveling valves are good since they are new and both needles dropped before replacing them.  So that leaves the air/hydraulic brakes.  I have sprayed the master cylinders, and the air lines under the brake pedal.  The last thing I can think of is the air cylinder for the stair slide out.   Anywhere else that I should look.   Thanks in advance.

[Mike Shumack]

Generally the "Green needle" if for the primary air system (the rear brakes) and the Red needle would be the secondary system,  but there is no standard/requirement and manufactures can use any color they want. You can easily test this by opening the air drain on the primary and/or secondary air tanks and see how the gauges respond.

Usually there are several (non-brake components) feeding off the air tanks. The coach builders will tap into which ever tank is closest. There would be a "pressure protection valve" (PPV) at the tank where the line feeds from. The valve is supposed to shut when tank pressure drops to set level (like 65 psi) so any leaks in components (like the step slide-out covers, air horn, leveling system, etc.) wont drain the tank completely. But these protection valve will leak internally and allow the tank to drain.

Here's an example of a tank setup (may be correct for your '98) Note the PPV locations

[Steve Huber Co-Admin]

Carl,
You can access the air line diagram for a 98 in Coach Assist, Owners Manuals/ 94-9* Manuals.
Steve

[Carl Boger]

Thanks Mike & Steve,   I now have a much better direction to go in.