The disc brakes on a vehicle are comprised of a smooth steel rotor, which your wheels are bolted to, and a caliper that encloses the front part of the rotor. The caliper holds the brake pads that are typically made of semi-metallic or ceramic material. When you step on the brakes, hydraulic pressure from the master cylinder forces the brake pads onto the rotor, slowing the vehicle through friction in much the same way as bicycle handbrakes.
You depend upon your brakes all the time and since it is typically between 40,000 and 60,000 miles before they need replaced, you tend to forget about them until they start squealing and making that awful grinding noise. That grinding noise is the metal backing plate of the brake pad contacting directly against the metal rotor. Anytime metal meets metal in moving parts its never a good thing!
As soon as you hear that noise, call us immediately or this could become more expensive as you may need to replace the rotors as well. Other signs of worn brake pads that you may experience are: your vehicle pulls to one side when you’re braking, feeling a vibration or pulsation through the brake pedal, the brake pedal goes almost to the floor before the vehicle starts to stop, and it takes you longer to stop than it used to.