Secondary brake air not charging

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Secondary brake air not charging

after the temperature drop every morning when I start my shift . after starting the truck my air buildup into the secondary doesn’t buildup it’s stay at the red zero bottom but my primary buildup. I can move my bobtail without issues. now if the truck run almost an hours soon I hooked to trailer and play with the brake valve on and off the buzzer goes off and the secondary tank start buildup on the normal way . I empty my tank at everyday in my post trip my dryer and compressor is working as it should . I wonder what is the issues I am having??? any suggestions or share tips knowledge will be appreciated I will attached the photos of the dashboard describing what I am seeing. thank you