Having an issue with being able to maintain air pressure system on 2007 Dynasty with 400 Cummins.
Had an air leak and had the air dryer changed. It seemed to work OK and put about 100 miles on it this past weekend. When I parked last night and was cooling down I noticed the air compressor was cycling on/ off at 110 PSI. This morning started the engine and pressure would not build past 80 PSI and continued to cycle on/off. I called the mechanic who changed the air dryer and he came with a new regulator, installed it and it made no difference.
I limped it to the shop with the help of external compressor.
The shop feels that the unloading valve inside the compressor is not funtioning and require s the complete change out of the air compressor. Has anyone had this type of thing happen?
I have talked to a few long haul truckers and hadn't had compressor issues with many 100000's of miles on their rigs.