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Old 08-10-2013, 06:00 PM   #1
Junior Member
Join Date: May 2012
Location: Southern CT
Posts: 12
Freightliner Air Suspension Valve

2004 Newmar Kountry Star
replaced RH front valve 11 months ago last August - leaking air in RH front again (as well as LH front.)

Not sure it's valve(s)?? however it will hiss & whistle from either side with no definite pattern of occurrence; seems to do it when pressure is between 65-100 pounds (?). When pressure builds past 100 it stops. When I hit air brakes (idling in driveway) pressure naturally drops & hissing starts.

Fear: loosing braking on long hill like that one on 81 south near Ravenna, PA.

I'm in over my head. Any suggestions appreciated.
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Old 08-10-2013, 07:24 PM   #2
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Join Date: Feb 2011
Location: Snowbird - Waterford Mi and Citrus Springs Fl.
Posts: 3,609
If I shut the engine off and step outside mine, I'll hear the slight hiss of a valve letting some air out of one of the bags as the ride height valves seek to re-level the coach after being relieved of my rather large 300lb b**t?

Could that be what you're hearing?
1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake
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Old 08-10-2013, 08:04 PM   #3
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Posts: 1,177
Blog Entries: 11
i all so get the hiss from time to time the valves seem to have a mind of there own

but when i let the rv set the air stays up fro about a week with no jacks
jacks all way make the hiss
can really under stand the hills tho

a low cost way to add parts is to go to a RV you pull it junk yard like we have here in FL and walk out with all kinds of parts thats what i did not sure whats around you

ahicks my but too is 220 LOL
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Old 08-10-2013, 08:36 PM   #4
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Join Date: May 2012
Location: Southern CT
Posts: 12
definitely not from me or wife exiting RV
Connecticut has no RV salvage yard
only the Freightliner dealer who treats us like crap
only dealer worse is the only Newmar dealer in Connecticut
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Old 08-11-2013, 06:15 AM   #5
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Workhorse Chassis Owner
Join Date: Sep 2007
Location: st.charles mo.
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You have to crawl under it and find out wear the air is coming from.
You will not lose your brakes if you lose air. When the presure gets below a set amount the parking brakes will apply and bring you to a stop.
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freightliner, suspension

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