I don't want to be "sour grapes" to everyone that is happy and optimistic about the brake problem or Kia's maintenance in general, so let my story be a cautionary reminder of what could happen. I had the brake vibration and issues with the limited slip differential on my 2018 GT. In the end, the Kia field service rep cited "outside influence" as the cause for both problems. They had "repaired" the brakes twice and replaced the limited slip once. When the issues resurfaced the 3rd and 2nd time, respectively, they refused to fix the problems. "Outside influence" is Kia speak for "the driver did it." After the shock of realizing that they weren't joking wore off, I left the dealership and promptly contacted legal representation to see if there was any recourse. The end of the story is that Kia ended up buying a car back that they could have fixed for less than $500 with new pads and rotors and changing the differential fluid. Needless to say they lost a customer in the process.