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Old 01-12-2016, 12:05 PM   #1
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Monaco Owners Club
Join Date: Sep 2015
Location: Murfreesboro tn.
Posts: 10
Hissing sound

Ok just drove our 2004 Monaco down to have tires put on. When I pulled up and parked I set the air brake. When I got out I noticed a hissing sound from under the front. The motorhome hadn't been started or driven for 2 months . Any idea what it would be?? A leak or bleed off.

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Old 01-12-2016, 12:39 PM   #2
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Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 19,300
Are you sure it's not air escaping from a tire?

The air bleed-off on my coach is at the rear, and it only does this when the engine is running and the air builds up to about 125 PSI. Also, it's only for a few seconds.

Joe & Annette

2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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Old 01-12-2016, 01:53 PM   #3
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Country Coach Owners Club
Join Date: Jan 2006
Location: Sacramento Area
Posts: 3,232
Could be your front ride height valve stuck slightly open.

I fixed mine 5 years ago by tapping it with a wrench.....
1995 CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
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Old 01-12-2016, 03:01 PM   #4
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Holiday Rambler Owners Club
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Posts: 4,573
Ditto on the air ride settling down. Put a few more miles on it.
Myron & Deborah
08 HR Endeavor 40 SKQ
2012 Ford Edge Limited FWD 3.5L
Aluminator tow bar, Demco base plate
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Old 01-12-2016, 04:38 PM   #5
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Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 7,222
I agree with the above, sometimes one wheel may be setting a little higher and wheel bleed off air. I like to spray the ride height valve assemblies once a year when I do my service to keep them from sticking.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab
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