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| Hello. I have 2007 Peterbilt 379. I was having issues where my primary and secondary air gushes were dropping to 90 psi so I had the compressor replaced. My question is if it’s normal to drop just below 100 psi when the truck is sitting and idling? When I started it up this morning it aired up to 120-125 psi but as soon as I got to where I was going it started to drop. I cannot find any leaks anywhere and the place that replaced the compressor couldn’t find any leaks or any issues. If this is an issue what may be the fix? Thanks! | |
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Primary and secondary air guage on peterbilt379
