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Old 09-06-2018, 06:02 AM   #15
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Have you checked the connections behind your air gauges? Although with that kind of loss it would be relatively easy to hear?

Mine was leaking from the primary air gauge connection from where the brass DOT quick connect fitting was attached to the gauge housing when manufactured.
I believe he did but will ask. Thanks
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Old 09-06-2018, 06:21 AM   #16
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Also, during inspection, some miss the treadle valve directly under the brake pedal on the underside of the floor.

You can see it if you crawl under the chassis and follow the steering linkage as a visual guide.
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Old 09-06-2018, 06:25 AM   #17
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Also, during inspection, some miss the treadle valve directly under the brake pedal on the underside of the floor.

You can see it if you crawl under the chassis and follow the steering linkage as a visual guide.
All good advise. I'll pass it along. Thanks again.
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Old 09-06-2018, 07:44 AM   #18
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...the primary air will hold for a period of time then slowly start dropping for about 5 lbs then drops rapid until it hits the governor telling the compressor to come on. It airs back up and repeats.

It does it the most when on the road but will do it occasionally when sitting idling.
Does Secondary air stay up (120+ psi) the entire time? Primary system is rear brakes.

You said the problem does occur at idle, so perhaps the issue is not driving related - its just that you spend more time driving than idling so you see the problem more often driving. If it happens at idle that sort of rules out air suspension components (doesn't rule out entirely but lessens the chances).
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Old 09-06-2018, 07:55 AM   #19
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Does Secondary air stay up (120+ psi) the entire time? Primary system is rear brakes.

You said the problem does occur at idle, so perhaps the issue is not driving related - its just that you spend more time driving than idling so you see the problem more often driving. If it happens at idle that sort of rules out air suspension components (doesn't rule out entirely but lessens the chances).
The secondary is unaffected. Other than operate as it is suppose to so when the compressor comes on it runs it up to I believe around 130 the pop off goes off and it comes down 5lbs +/- and holds until the Primary causes the pump to come on again. I have had it do it idling but rarely. That's what makes it so hard this rig is so loud outside when running hearing an air leak is futile.

My thought now that we have checked mostly everything is it being one of the pop offs or check valves that is weak. It might test fine while sitting but on the road or less when idling maybe one of the seats held by air has a small leak. As the air drops the seat allows air to leak faster until the point it kicks the compressor on and brings the air up enough to seat it again. I don't know that just seems plausible.

I called the mechanic this morning he checked the treadle valve and the gauge both are ok. No leaks.
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Old 09-06-2018, 08:11 AM   #20
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I would replace the check valve on the Primary Tank. If it is leaking it can allow air to escape back through the charging circuit.

The check valves are cheap and if nothing else, it will at least help you to isolate the problem (eliminate any components in the charging side like dryer, compressor, etc.).

Like diagnosing electrical issues, it is easier t find the problem if you divide up the circuit and then isolate the problem to a specific area of the circuit (electrical or air circuit). The check valves isolate the circuits but they can also leak over time then one side can leak into the other, so replacing them is cheap insurance.
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Old 09-06-2018, 08:29 AM   #21
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I would replace the check valve on the Primary Tank. If it is leaking it can allow air to escape back through the charging circuit.

The check valves are cheap and if nothing else, it will at least help you to isolate the problem (eliminate any components in the charging side like dryer, compressor, etc.).

Like diagnosing electrical issues, it is easier t find the problem if you divide up the circuit and then isolate the problem to a specific area of the circuit (electrical or air circuit). The check valves isolate the circuits but they can also leak over time then one side can leak into the other, so replacing them is cheap insurance.
Interestingly enough I was on with REV RV group even though they no longer support these coaches I have always found them extremely helpful. Anyway he is saying almost word for word what you are. So we are going to change the check valves and pop offs and see what happens. Thank you!
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Old 09-06-2018, 03:12 PM   #22
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Ok, you have given two big clues. Only when coach is on, and going down the road. THe HWH system only opens the travel solenoid so when the key is on. So think "suspension system". I can think of two things that need to be checked. The first is all height control valves need to be checked for leaks by detaching the control rod and moving the arm through its arc. I have seen HCVs that only leaked in a certain position. Second, you may have a hole in an airbag, or a leak between the HWH six pack and the airbag that opens and closes with movement.

None of the systems upstream of the HWH six pack care whether the key is on or not.
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Old 09-07-2018, 06:48 AM   #23
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Ok, you have given two big clues. Only when coach is on, and going down the road. THe HWH system only opens the travel solenoid so when the key is on. So think "suspension system". I can think of two things that need to be checked. The first is all height control valves need to be checked for leaks by detaching the control rod and moving the arm through its arc. I have seen HCVs that only leaked in a certain position. Second, you may have a hole in an airbag, or a leak between the HWH six pack and the airbag that opens and closes with movement.

None of the systems upstream of the HWH six pack care whether the key is on or not.
Thank you for the input. We checked the air bags fully no leaks of any kind. It looks like someone replaced them at some point they look new. I will have them check the other items you mentioned also.
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Old 09-08-2018, 07:06 AM   #24
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Nasdaqsam,

Please get back to the forum when you find what the issue is.

These weird anomalies from time to time help us help others down the road.

Thanks!
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Old 09-13-2018, 01:54 PM   #25
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For those following this thread. We simply can not find the issue. All the check valves and pop offs have been changed and as you can see from the above posts mostly all the other parts as well. It is still doing the same thing.

All we can do now is drive it until whatever it is lets go. Hopefully nothing that will leave us stranded but being an air issue it more than likely will.


Thanks for all the input.
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Old 09-14-2018, 04:57 AM   #26
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Brazels out in Washington state (800-417-4559) is a suspension specialist facility that caters to and advertises to the RV industry.

Perhaps they may have come across the scenario your are experiencing during their years of servicing coaches.

Sometimes with these anomalies, its just a matter of finding another owner who has already pulled all their hair out and can save you from doing the same. Heck, you have nothing to lose at this point.

When/if you find what was causing the problem, please give us a shout back as everyone is a bit stumped at this point.

Good luck to you and I certainly hope the issue doesn't get you stranded as a result.
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Old 09-14-2018, 09:55 AM   #27
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Brazels out in Washington state (800-417-4559) is a suspension specialist facility that caters to and advertises to the RV industry.

Perhaps they may have come across the scenario your are experiencing during their years of servicing coaches.

Sometimes with these anomalies, its just a matter of finding another owner who has already pulled all their hair out and can save you from doing the same. Heck, you have nothing to lose at this point.

When/if you find what was causing the problem, please give us a shout back as everyone is a bit stumped at this point.

Good luck to you and I certainly hope the issue doesn't get you stranded as a result.
I'll give them a call it can't hurt. I have one more thing I am going to another mechanic do...well......just because it's a possibility. Which is remove all the air salvo's off the distribution blocks, change the O-rings, grease them and re-install. It's a long shot but thinking it's possible that just sitting the O-rings are sealing, on the road the added pressure of the suspension bouncing is maybe causing one of them to unseat.

If I ever find the issue I will be sure to update this thread. I am about to go pick it up I don't think I want to see the bill for labor on this issue.
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Old 09-14-2018, 10:35 AM   #28
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I apologize in advance formthis request but sometimes information changes and gets confounded as a problem like this develops.

Would you mind taking the time to cleary state what the air pressure is doing, exactly when and what conditons it happens, what instuments you use to tell you this, and what parts have been checked or replaced?

That may seem like a lot to ask, but as you continue to chase this issue, you will have to logically and succintly explain it to the next mechanic.

If you take the time to do this, you may find the logical answer or someone on the site may be able to help
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