If a car's brakes grind when the car comes to a stop, worn out or defective brake pads could be damaging the rotors of the brakes. Brake problems of any kind should be inspected and taken care of as soon as possible to avoid further damage and reduce the chances of the brakes failing entirely.
Besides grinding, the car's brakes might also make a high-pitched squealing noise, which is another sign that the pads might be wearing thin. Besides the brake pads, the brake discs might also be in need of either repair or replacement.
An inspection is the best way to determine exactly what is going wrong with the brakes. It's recommended that motorists have their brakes inspected at least twice a year even if they aren't making noises. With cars that have alloy wheels, the brakes can be inspected by looking through the spaces in the middle of the wheels. The brake disc should be shiny from the inside to the exterior edge. There should be more than 1/8 inch, the width of two stacked pennies, remaining on the brake pads if they are still in good condition. Replacing the pads doesn't always have to be done at a professional auto repair shop, but it should be done by someone who knows what they are doing.