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Removed lower section and cleaned, resealed Purge valve and truck was able to build air.

I removed the purge valve and cleaned up the bore, it was pretty tight with very little debris, I resealed and going to put on this weekend, hopefully that may of been the problem. I was told it would air up before, the desiccate filter was like new.

This is a cargo truck, and i am pretty sure the air dryer has not been serviced, i did crack the air bleeds on passenger side, very little air came out, this was just released from service and is now owned by a museum. I found a rebuild kit for under 150.00 and will try that

Have seen several posts on this subject on not building air, I have a M939 that i removed the air discharge line from compressor (brass line) and could feel air pushing out of compressor (rules out bad compressor), installed new air governor and truck will not build air at all. Possible that the...