brake warning light just came on

Hello, I'm Danny.

Here is the information you requested. The brake warning light is on possibly due to having a low brake fluid level in the brake master cylinder by having worn out brake pads. This is a tutorial showing what is involved on how to change front brake pads and brake rotors:

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

I've attached picture steps below on how to change the front brake pads and rotors on your car. Hope this helps and thanks for using 2CarPros.