My TJ has all new pads and rotors front and rear. New calipers in the rear and I finally got around to replacing the front calipers today. I left those as low hanging fruit due to the fact the originals were working just fine. No issues (so I thought). I couldn't have been more incorrect. Replaced the calipers and holy cow, vastly improved the braking capability. At a guess, it cut the stopping distance in half, much smoother and stops straight as an arrow. Moral of the story? There is no such thing as over doing it with your brakes and there is a huge difference between good and great.