My rear brakes are squeaking when I brake at low speeds which is annoying at stop lights. I checked and I can feel a slight groove on both rotors. I checked the pads as well and they have a good amount of life left in them. So would the issue be the rotors wearing way before the pads or could it be the pads need replacing because they’ve worn, even though it's not down to the sensor yet? I already bought some oem brake pads and plan to just replace those on the old rotors but wanted some second opinions.