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Good hint, mud daubers here are a force to be reckoned with... they get in everything... ill def check these....

An update on this issue... Since getting the pressures up, I've been running it around the farm and was able to get the truck under the M373 trailer we have. We needed to get the truck underneath the trailer since its landing legs are not functional and missing critical parts... We bought a...

thanks for the details ronmar. i understand more now. i dug up a pressure guage today so ill check the pressure on the wet tank and see if the ctis switch is working... sounds like every thing else is as it should be... ill close this thread and start another if more issues come up. thanks...

yea i felt the pressure was too high simply because its pegged the guage.. i would expect 100-110... im def gonna see if the guages are correct, and also dig into the governor connections.. thanks Chris

do your guages sit at 120 psi at idle?

well im not sure actually, it seems abnormal to me. the guages are pegged at 120psi then blows the relief in the dryer... chris

Update... replacing the two check valves allowed the truck to build 90lbs of pressure in under 2 min. now however i think it still not shutting off the air compressor as it should. its still blowing air out the air dryer every now and then... also ctis not working, but we are getting there...

I feel much better about understanding how this system works now, so i plan on getting down into it this weekend. my concern is that since the air dryer was so badly damaged that it obviously didn't do much by way of removing the moisture, it could mean the other sensors on the wet tank are...

a quick update. i ran down to the shop and pulled off the two check valves at the primary and secondary air tanks and both were completley stuck shut. caked in rust. i have some on order should be here saturday.. more to follow...

when i first got the truck i hooked the front emergency air output on my M923 to the front emergency gladhand on the 1088 and did find the severely leaking rear inversion valve. once i replaced that i did it again and didnt hear air hissing anywhere i did replace the air dryer and governor on...

update... i followed the troubleshooting and it takes me to "replace compressor"... i vaguely remember something about these compressors in early versions having some sort of issue where the drive gear wasnt properly secured to the compressor shaft.. or am i delusional at the thought of...

an update, it looks like this release is coming from the bottom of the haldex air dryer. also if i let it sit and run for over an hour i never get more than 60 psi.. no matter what. doing the troubleshooter now.. chris

its def not set to supply..

hello all, my "new" M1088 has problems getting pressure above 60psi. it takes over an hour to get there. also if i touch the brake petal at all it drops to 40psi. i found a leaky inversion valve and replaced it, also replaced the roached air dryer assembly with a new haldex unit and replaced...