Code C1344 coming back

I was trying to get some help on the newbie forum so I post here

I replaced rear drums and shoes on my 08 Prius When removing the shoes on the rear left wheel I wanted to check for leaks under the rubber boot and by mistake I grabbed and pulled out the piston arm. It all came out, including the spring inside. It was out for 5 sec maybe until I put it back in. Some fluid came out and for sure air - in
So after the replacing of the shoes and drum I drive the car and have the 3 yellow lights and the red brake light.
I used the techstream I have now and code is C1344 - RL wheel. So I obviously caused damage to the system
I clear the code and the car drives for hundreds of miles with no problem, BUT the moment i press the brakes I would say beyond 50% brake pedal then the code comes back up and brakes work only as conventional (no regen brakes)
This happens every few days as some cars cut me off so I have to slam on the brakes.
Then I clear the code and drive the car perfectly .
This has been for lets say 3 weeks now and there is no brake fluid leak from the RL wheel for that period.

What should I do to stop this?

 

NO, I didnt bleed the brakes. I have the techstream if this would help but I dont know how to. Tried but I think I do something wrong and the Techstream shows me error. I am sure I do something wrong

 

Thank you for the link. I have read this article but was not optimistic as i had the techstream thinking is better but as of right now i am going to try it in a few days