Continuous air leak from air dryer purge valve

So what is the fix? Mine does the same thing now. Sometimes the purge valve leaks and won't allow pressure to build. I have to hold my finger over the hole. Yes, it has a new purge valve, new filter, new governor, new line from compressor to air dryer, new unloader valve/piston in compressor, new treadle valve and new dash valve.

 

New dryer. Still does same thing. Well, atleast we know what it is not. Ha

 

Check that the compressor discharge line is not plugged or crimped and check the check valve between the dryer and first tank.

 

Awesome. Will do. Sometimes at 90 psi it reboots. Sometimes it gets down to 60 before it engages.

 

Well, after a few weeks of switching valves from one truck to another. The culprit turned out to be 1 of two final replacements. There was a leaking T connector behind the dash that connects to cab suspension switch. Then just for no particular reason, we installed another new governor on the new AD-IS dryer. Darn thing fixed the issue.

 

I just replece the purge valve on the airdrayer and it still leaking air on my mack 2010 I change the cartridge too

 

Check governor, comp discharge line and my personal favorite the check valve between the dryer and first tank.

 

Will do