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Old 08-22-2011, 10:28 AM   #11
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Join Date: Oct 2009
Location: Ontario Canada
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Funny you ask. After alot of research before I took it to a dealer for $$$$ I just ordered on Friday a little relief valve that goes on the Haldex air dryer my unit uses. I was told on 2008 they used a 175 psi vlave here and it should be a 200 psi. As valve gets worn it starts to blow off easier. This is only what I'm told by a local freightliner dealer. The valve is $17.00 and easy to change (it's as bottom is the air dryer on mine and on the driver side of the dryer at the very bottom.) It's about the size of your thumb. So for that price and my dealers advice I'm changing mine. Were hoping this is what the air popping off is. The part # is HDX KN31529. I should have it by this Wed. Sounds Tumar like it's the same thing. My was releasing air at about 14-20 times steady and varied when it did it but it was not normal. Hope this helps.

...Ron

(I might of answered this a couple of times - sorry)
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Old 08-27-2011, 11:46 AM   #12
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This very important!! You MUST remember to empty the air tanks on a weekly basis when being used as water can build up in the air tanks reducing the air capacity this can lead to loss of air pressure if left unattended especially in humid climate. A symptom of this is the Air relief valve blowing off more frequently than is normal.
Any big rig truck driver will tell you this a normal weekly routine on their rigs!!
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