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Primary and secondary air guage on peterbilt379
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hillfarmer
Posted 1/12/2026 12:26 (#11507162 - in reply to #11506568)
Subject: RE: Primary and secondary air guage on peterbilt379



Ndfarmer26 - 1/12/2026 08:13

marc02 - 1/12/2026 07:06

Is it leaking out the bottom of the dryer? That's my experience.



I had the air dryer replaced less than a month ago and I just walked around and got underneath and didn’t hear anything at the air dryer.


so build to 120 shutoff the engine and take a one gallon yard sprayer and put soap in it

spray the lines starting from the compressor back to the end of everything

going to 130 or 140 needs to be "verified" that is too high
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