Read about check engine light
Do not put off getting those brakes checked! The brake shoes will start scratching the rotors if the pads are too worn down. Instead of only replacing the pads, a very reasonable and inexpensive fix, the cost of getting your brakes in good condition again will go up because now new rotors are needed. There are other reasons to get your brakes checked. It is very dangerous if brake lines on a car stop working. Under no circumstances should anyone drive a car with a broken brake line, not even if it is the back brakes versus the front brakes.