More then likely you need to bench bleed the master cylinder which you can do on the vehicle if you already installed it. You just need to route the lines back into the master cylinder and then pump the pedal until the air is out of the lines.
Here are some guides that will help with this:
https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system
https://youtu.be/ye64wlARgcs
Plus below is the process from the manual. Let us know if you have questions. Thanks
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Friday, March 5th, 2021 AT 1:57 PM