Last winter I redid my trailer.. I install all new brake plates and stainless lines. I removed and visually inspected my actuator. I bled the system and am confident I got all the air out.. So here is the question what is making the brakes drag. It seems the actuator is not releasing the pressure created by braking. I have to pull over and release the pressure to get home. It worked well the first few times out but, every time since it has given me trouble.

Any ideas? I don't want to just start swapping parts blindly.

Thanks in advance for any knowledge based suggestion.