Replaced front brake pads, now pedal goes down to floor.

Hello,

Brake pedal can go to the floor for few different reasons.
It can be air in the line that needs to be bleed. It can also happen if there is a leak in the brake line or a faulty master cylinder.

Take a look at this guide, it covers all the typical reasons:

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

Here is a guide to how to bleed the brakes:

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

Please let me know of any questions.
Thank you.