My brake pedal goes to the floor. We have changed the pads and rotors?

I am not sure how they can say there is nothing wrong if the pedal goes to the floor. Does this happen all the time or just sometimes?

Here is a guide that covers this issue in more detail:

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

In most cases this is an issue with the master cylinder so in the event it proves out to be this, I attached below the process on how to replace this.

However, I would suggest with bleeding the brakes first just to make sure you don't have air in the lines.

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

Let us know what questions you have. Thanks