Brake caliper Issue, do I have to bleed brakes?

Short answer is "yes", but there are some details to this that some of our more storied experts here in Priuschat will give you to get this done right...... You definitely are in the bleed the brakes territory and there is more to resetting the cover.

 

If you didn't let the fluid drain out of the master cylinder, just a simple bleed is all you need.

Clean up the puck, put some brake fluid on it and carefully "ease/force" the puck in.

Always easier said than done, but, doable. Just take your time, and try to stay patient.

 

You should know the rubber sheath that you see is only the visible dust boot. The rubber piston seal is down in the cylinder where you don't see it, and that's what you need to get the piston reinserted through.

It wouldn't be crazy to pick up a junk caliper just to practice on even keeping the original caliper on the car.

 

For next time: it's always good to disconnect 12 volt neg cable before lifting off caliper, and after everything's back together, before reconnecting 12 volt, pump the brake pedal several time, take up any excess pedal travel.