Hello,
The brake pedal can go to floor for few different reasons.
It could due to a leak in the brake system, it could be for having air trapped in the lines, faulty master cylinder. It can also happen if the fluid is low.
Here is a helpful guide that covers the basics:
https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor
Make sure the fluid is at the correct level. Then check for any leak, look at all the components including the calipers and wheel cylinders.
If you do not see any leaks, next step would be to bleed the brakes to purge any air that might be trapped.
https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system
I have attached the brake bleeding procedure below.
Please let me know of any questions.
Thank you.
Images (Click to make bigger)
Thursday, October 14th, 2021 AT 9:11 PM