I got a grinding while braking

Hello,

Typically, you will hear grinding noise when the brake pads are worn all the way down to the metal. When that metal contacts the rotor it makes grinding noise. Usually this damages the rotor.
Replacing the pads and resurfacing the rotors (if they are within specification) should take care of this issue. If the rotors are blow minimum thickness, replacement is necessary.

Here is a helpful article:

https://www.2carpros.com/articles/how-to-replace-front-brake-pads-and-rotors-fwd

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.