Why my air compressor is losing some air pressure when fully charged

yipeemartin

Hey Scotty, i want to ask u why my air compressor is losing some air pressure when it charging to the maximum pressure.......the motor will cut off at 115psi, then i can see the meter gauge will slowly come down to 110psi then it will stop losing air pressure at 110psi....i cant hear any hissing sound, i cant see any air bubbles when i put some soapy water on every joint on the air compressor.......izzit the faulty check valve? please advice, thank you