Any time the brake system gets opened (i.e. changing caliper, master cylinder, brake hose/line), air will get into the system and will require bleeding the brakes to purge the air out.
Here is a helpful video of brake bleeding procedure:
I have attached the instructions below.
Please let me know if you have any questions.
Images (Click to enlarge)
Tuesday, November 2nd, 2021 AT 5:20 PM