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Old 07-19-2018, 09:43 AM   #1
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Air Leak - Secondary System

Hi All,

I've been chasing an air leak now and hoping you knowledgeable folks can point me in the right direction.

My primary tank (white needle) will go for quite some time without losing air. It's been shutdown for almost 4 days now and it's just now down to 90 pounds from 125 where I shut the engine off. It loses almost no air while driving.

The secondary (red needle) will go from 125 to 90 and kick on the compressor about every 3 minutes while driving. Also, after I park, that system will be empty within hours.

One would think with an air leak that fast you would be able to hear it. Two of us crawling everywhere under the coach cannot hear anything leaking. We've soaped everything I think. There are some VERY tiny leaks on the six pack solenoids but not 30 pounds in 3 minutes worth.

Your input is greatly appreciated.
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Old 07-19-2018, 09:52 AM   #2
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I had same symptoms and finally traced it to a bad rear ride height valve. When it hit a certain spot it would leak badly. Replaced valve and now holds steady for long periods of time traveling down the road.
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Old 07-19-2018, 11:46 PM   #3
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Have you tried releasing the air brake, chock the wheels and just letting it sit to see how often the compressor cycles.

From the compressor air goes to the dryer, then onto the wet tank, main tank, secondary tank, aux tank in that order. There is check valves between each tank.

The ride height valves come off the wet tank. The governor gets its signal from the wet tank as to when to turn on and off the compressor.

All air lines are color coded as to what tank they come off of.
Wet tank=black
Main tank= green
Sec. tank= red
Aux. tank=brown

Actually 3 min is not bad. But it depends on the road conditions. Driving straight on a smooth road I was getting between 6 to 7 min, after replacing ride height valves, and going through the whole system.
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Old 07-20-2018, 06:09 AM   #4
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As a point of reference for our coach. The compressor takes 30+ minutes going down the highway before cycling.
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Old 07-20-2018, 08:18 AM   #5
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Quote:
Originally Posted by bneukam View Post
Have you tried releasing the air brake, chock the wheels and just letting it sit to see how often the compressor cycles.
Have not tried that yet. Would that be checking the front brake system?
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Old 07-20-2018, 11:44 AM   #6
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Quote:
Originally Posted by 767driver View Post
Have not tried that yet. Would that be checking the front brake system?



With the coach just sitting at idle it should not cycle at all, since no air is being used.

CC used a two tank system with dividers in both to give you the 4 tanks as described. They are not very big.
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Old 07-20-2018, 05:15 PM   #7
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Should have mentioned that your gauges should be running within 10 lbs of each other. Maybe a bad check valve.
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