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Mystery air valves
Can someone help identify the two pneumatic valves? What is their function? They are leaking through compression fitting so I also need to replace the fittings.
Are there any recommendations where I could source those parts while in San Antonio, TX?
My coach has the HWH leveling system so they may be related to that system.
Andy
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6 Replies
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Andy, those are the three valves that measure front, rear and aux air pressure.
If you have the SilverLeaf dash they are about $1400 each. I think that is very high but that is what they charged me for them.
Any NAPA store will have the fittings. You may only need to replace the little brass compression ring that goes over the plastic hose and into the valve body. Be sure and cut off some of the hose well above the little compression ring so you will have new hose to work with. I would replace the cap that screws down on the fitting as well.
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Thanks Buddy. I did not know that NAPA carried these types of components. Nice that I can use my discount card.
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Just replace the brass part not the black electrical sensors. The part of the valve the hose goes in.
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It looks pretty straight forward. That would explain why I was getting a big drop in the pressure reading (118 to 33 psi) overnight but the pressure would build extremely fast so I did not really believe it was that low.
Thanks again.
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Well, after playing with this repair it turns out that the pressures were really that low. I thought that there would be a check valve or something that would prevent the front and rear brake pressures from being affected by the sensing units but it appears to be a direct connection. The compressor’s size seems to overcome the leak rates of the two sensing units. It’s nice to finally have the time to learn some of the intricacies of our bus.
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This is just a general observation that everyone should make………..
When whole coach air pressures are low there is a large volume of air at 120 PSI needed. It takes time to build the systems to that pressure.
Anytime someone comments about how healthy their compressor is because it takes so little time to pressurize the coach bells start going off in my head. I am not saying there is a problem with this particular coach, but often when the time required to charge the system is short, it is often due to air tanks containing a lot of water, reducing the volume of air needed.
Over time we get a sense of how fast our coaches build air. If the time gets less and less there is a problem because air compressors do not get more efficient with age. Quite the opposite.
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