Hello,
This could be due to a bad master cylinder.
If the seals inside the master cylinder are bad, then it will not build any pressure and will not bleed.
https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder
Try bleeding the master cylinder to see if you are able to.
Here is a helpful guide of how to bleed the brake system:
https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system
I have attached the master cylinder bleeding as well as replacement procedure below. Also included the brake bleeding procedure for your reference.
Please let me know of any questions.
Thank you.
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Thursday, October 14th, 2021 AT 3:19 PM