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Old 11-14-2019, 09:00 PM   #15
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I chased down some air leak issues in my rig about a month ago. I have two comments. First, i cannot hear my dryer cycle in my rig when going down the road, over the motor noise so the only clue i have is from the gauges. second, i do not think it could be an air line leak or it would leak while you were sitting and the gauge would be fluctuating. I cant tell you what it is but it sounds like its between the pump and the dryer. But it would not hurt to also to the standard brake tests to check that system out also.
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Old 11-15-2019, 04:24 AM   #16
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Originally Posted by ftodaro View Post
I chased down some air leak issues in my rig about a month ago. I have two comments. First, i cannot hear my dryer cycle in my rig when going down the road, over the motor noise so the only clue i have is from the gauges. second, i do not think it could be an air line leak or it would leak while you were sitting and the gauge would be fluctuating. I cant tell you what it is but it sounds like its between the pump and the dryer. But it would not hurt to also to the standard brake tests to check that system out also.
With 3 tanks and only 2 gauges, you can have a leak without the gauges fluctuating.

The tank without the gauge is the one that is used to start and stop the compressor. The starting and stopping of the compressor is what controls the air dryer.
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Old 11-15-2019, 06:59 AM   #17
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With 3 tanks and only 2 gauges, you can have a leak without the gauges fluctuating.

The tank without the gauge is the one that is used to start and stop the compressor. The starting and stopping of the compressor is what controls the air dryer.
Thanks twinboat. It's getting looked at a diesel repair shop on Monday. I'll report back what the diagnosis is.
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Old 11-22-2019, 10:27 PM   #18
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So to tie a big ribbon around this thread in case others are reading, the diesel techs found a few problems with my air system. First, there were multiple air leaks that had to be fixed. Then, they found an air line going to the drier had a dip in it and was collecting moisture so they rerouted the line. Finally, they found a rear right dump valve that was leaking air, so they replaced that.

After doing all of those repairs and 400 bucks later, the air system is pretty tight and the purge valve isn't going off at all unless I brake. The purge valve sounds differently, too now. Not sure why. It's a much more "crisp, quick" purge than it was before. Or maybe it's my lying ears. Not sure.

Anyway, thanks for all of the help!
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Old 11-23-2019, 06:16 AM   #19
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So to tie a big ribbon around this thread in case others are reading, the diesel techs found a few problems with my air system. First, there were multiple air leaks that had to be fixed. Then, they found an air line going to the drier had a dip in it and was collecting moisture so they rerouted the line. Finally, they found a rear right dump valve that was leaking air, so they replaced that.

After doing all of those repairs and 400 bucks later, the air system is pretty tight and the purge valve isn't going off at all unless I brake. The purge valve sounds differently, too now. Not sure why. It's a much more "crisp, quick" purge than it was before. Or maybe it's my lying ears. Not sure.

Anyway, thanks for all of the help!
congrats on the fix, and thanks for reporting back.

When i replaced my ride height valve it sounded different also, i noted the size of the exhaust port on the new one was smaller which changed the pitch of the dump of air, nothing to worry about for sure.
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Old 11-23-2019, 09:52 AM   #20
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Great news. Again thank you letting us know what the fix was. Safe Travels
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Old 02-13-2020, 06:13 PM   #21
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I suspect that multiple things can cause this. I had a situation where the purge valve went off when accelerating. It sounded like a small steam train.Freightliner said replace the dryer cartridge. I did and it seemed to improve but it still did it some of the time. I found that it was doing it only when something was using air and thus the pump was on during higher engine speeds and produced excess air which was purged. The cause of the air use, 9 times out of 10, was the AC condenser fan which is powered by air in our coach. We listened for a while and no AC, no huffing, AC on only chuffs when the fan cycles on.
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