Why are my brakes grinding?

What causes brakes to make a "grinding" sound?
There are 2 major causes of brake grinding. If the grinding sound occurs when you press on the pedal, it's usually because the brake pads are worn out and scraping against the rotor. The rotor disc is supposed with part of the caliper. This isRead more: My Mechanic Said My Brakes Are "Metal to Metal:" What Does That Mean?
Your brakes might also make a grinding sound if a foreign object, like a stone, gets lodged somewhere in the caliper. When this happens, the brakes will usually make a consistent grinding noise as the vehicle is in motion. A foreign object in the brake mechanism can cause some serious (and expensive) damage to your braking system so it's best to come in for service as soon as possible.