I had to replace the kit because one of the rotors was deformed and caused a lot of vibration when braking. I bought them specifically because of their so-called standards, which are designed to prevent this in the first place. The second set played much better with no vibration at all. However, it squeaks when stopping with light pedal pressure. With strong pressure everything is fine. I hope that goes away with time or I swap the pads out for something else. Very disappointed with Power Stop. I keep seeing them advertised on the Power Block TV show and figured that shouldn't be a problem. I will no longer use them.