2015 Kia Optima LX
I bought a 2015 kia optima with 40k miles on it that had apparently sat for a long time and both the front and rear brakes were sticking so I replaced front pads & rotors as well as serviced the calipers. The rear brakes still have over 50% left so I decided to just service the rear calipers and make sure everything is lubed up and moving freely. But, when I looked at the rear calipers the pistons are broken the same way in the same spot due to a tab on the rear brake pads. I attached a photo of the broken caliper piston and one with the piston and the back of the brake pad where you can see how the tab caused the damage. Only explanation I can think of is that they're the wrong pads, but the car only has 41k miles so the amount of wear is consistent with them being the original, factory installed pads. Has anyone else seen this? The calipers are not leaking, should I look into replacing them anyways?