Brakes that are grinding or squealing can mean that your brake rotor is contacting your brake caliper. The screech of metal-on-metal is pretty hard to miss and can mean that your brake pads have completely worn out. Most disc brake pads manufactured today are made with a small piece of metal called a wear indicator. When brake pads are worn past a certain point, the wear indicator makes contact with the disc to provide a warning squeal that means it’s time to swap out your brake pads. Noises sometimes come and go during certain situations, such as hard stops, but any sort of odd noises with your brakes shouldn’t be ignored.