I took the main air line hose off the air compressor ,and force air to the air dryer. The air dryer didn't release air to the tanks.
Then I hooked the main air hose from the compressor to the air tank, now the air is going to the air bags,So now I no it's the air dryer.
Now I have another issue. My air dryer is connected to the air tank, so after it build air my brake light or alarm won't go off. Is there any solution to cleaning the air dryer or air dryer filter?