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Old 04-26-2019, 06:58 AM   #1
Senior Member

Join Date: Sep 2011
Posts: 1,472
Chasing air leak you can't find?

After replacing all ride height valves, pressure protection valves, and soaping every connection and device I could find, I STILL had a relatively fast air leak in the rear system. Long story short, in desperation I hired a short, wiry, young guy to replace my treadle valve and ALL its associated push-to-connect fittings. Five hour job. I virtually never hire anything done, but this project required more contortions than my 70 year old body could do. Itís a bitch of a job, but the young man got it done.

Air previously went from 120 PSI to near nothing in two hours. Now, it holds for days.

I have no idea whether it was the treadle valve or just a leaking fitting. I replaced it all since the job was such a booger I wasnít in the mood for experimenting. Braking performance was never an issue.
Van W 2000 Dynasty 36
ISC-350, pulling one Harley
200,000 miles
Southeastern NC
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Old 04-26-2019, 09:05 AM   #2
Junior Member
Join Date: Jun 2018
Posts: 19
Is the tech in NC? I am in Durham and struggling to find a decent place to help me with my leaks.
2018 Artic Fox 25W
2016 F-350 6.7L 4X4 SRW
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Old 04-27-2019, 07:38 AM   #3
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Join Date: Sep 2011
Posts: 1,472
Leenheer Automotive
Carthage, NC

About 1.5 hours from you on US Hwy 15-501.
The same wiry little guy does not work there now, but these guys own motor homes. MOHO's are difficult to work on, and I'm sure it's not their favorite, but they do lots of heavy truck work, and I've used them for years. Fairly large shop with 10 bays. They stay very busy. Karen and Jeff Leenheer. Tell them I sent you, please.
Van W 2000 Dynasty 36
ISC-350, pulling one Harley
200,000 miles
Southeastern NC
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Old 04-27-2019, 02:55 PM   #4
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Join Date: Jun 2007
Posts: 241
I chased an air leak in my 96 Monaco Windsor for 3 years now. I read on the Monacoers list to put a can of Freon in the air tank and pressure up and get the sniffer out and check for air leaks. The first leak was found in the brake treadle valve and I could hear it and I replaced it thinking - Eureka I finally found it..
I had a good feeling until the next day the pressure dropped from 125 to 60 lbs. Out comes the sniffer again and lo and behold, the air throttle was leaking out it's vent hole.
I got a kit off ebay and rebuilt it too and after 5 days, the pressure dropped 10 lbs.
I'm gonna call it good!
Skip H
96 Monaco Windsor
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air, leak

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