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<p>[QUOTE=&quot;American trucking, post: 11968009, member: 332855&quot;]Hii i just bought new freightliner cascadia from first day I noticed the air dryer purge every minute sometime 30 sec and sometime every 2 minute. I took truck to dealership they changed the air dryer but it still doing same and the dealership said this is normal. Keep driving. So now I noticed that first the air dryer purge (a small noice of shi shi) then it start the air compressor for 10 to 15 sec then again air dyer purge and then after 1 min air dryer purge again and start the air compressor again and this continues on idiling as well as road . And the air pressure of primary and secondary always stays on 123 to 125 psi[/QUOTE]</p><p><br /></p>

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