Error codes after brake job 2018 Prius two

Hello all. I have tried to find an answer to this, but can't get a clear answer.

Recently my dealer said I needed new brakes and rotors, front and back. They quoted me 1200. So that wasnt going to happen. I went to another mechanic I trusted and had them done for about 250. As soon as they set it down and turned back on, the error codes started to fly. I can't recall all the messages, but here are the ones I remember:
Brake fluid low
Brake system malfunction
Pre collision system malfunction
Abs malfunction
Traction malfunction
Parking assist malfunction

All say visit your dealer of course.

There were more I think, but cant remember it and am not at the car right now. The mechanic pulled out his scanner and went about clearing codes. After a little, all codes cleared. I went home, testing all the systems it complained about and they all seemed to work just fine.

Two days later, I started up the car and all the error codes came right back on. I'm going back there today so they can have another look. I dont have the exact error codes at this time, but can get them in a few hours when I'm there. Any suggestions on what happened, what can be done, and if this is just a matter of codes or am I going to need more work done?

Thanks for any and all help.

 

Funny enough, that was it. Went there, he checked that immediately, drained out the air and refilled the fluid. All codes cleared and didn't return. Apparently one of the pistons had gotten pushed all the way out of the caliper and let some air into the line. Thanks for answering anyway!