Detroit S60 14L

[Adv311]

Hey guys looking to get some help or advice. I have an issue with my truck that doesn’t want to build air pressure. It takes way longer than it should and doesn’t really want to get to 125 unless engine is being revved or driving. Checked for all leaks , changed governor , filter , main line from compressor to Air Dryer and still same problem. After I changed the Governor for a while it just stayed at 50 psi on secondary tank. Any advice would help , thanks.