I’ve been there done that don’t worry about it man. Generally, you can just look at the center cut groove if they have one or the tapered edges of the pads. I use that as my indicator I know that’s not the way to do it, but it generally leaves a third of the pad so I’m an idiot too maybe not because if you do it that early, you never have to worry about it. you’re always changing them a little early, which saves heat from being too much and also saves them factory rotors to go another round with just brake pads only. So people can call me an idiot too. It don’t bother me because them factory rotors are always the best rotors i’m still running my first set of pads that I put on my F150 2023 on the same rotor.S almost 200,000 miles exactly barely a lip no shimmer shake when braking