I hear a grinding and scraping noise when I step on the brake really fast.
It sounds like your brake pads are below minimum specifications. Now the brakes are grinding the rotor surface as your brakes are applied. Look at your brake caliper behind your wheel and see if the pads still have thickness to them, also look at the rotor surface, inside and out, to see which wheel has the bad brakes. A mechanic, such as one from YourMechanic, can help you quickly diagnose and repair your issue.
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