Hello,
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:
https://youtu.be/w7gUsj2us0U
https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system
I have attached the instructions below.
Please let me know if you have any questions.
Thank you.
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Tuesday, November 2nd, 2021 AT 5:20 PM