Garage Files: How to Check and Replace Your Brake Pads
10-Brake pads are made of two parts—the pad material and the backing plate. Pads should be replaced when the pad material thickness wears to less than 1 millimeter, or preferably sooner. Letting pads wear more than this puts you at risk of damaging the rotor or caliper, not to mention puts you at higher risk for brake failure. You can check this measurement using a caliper like so.