I honestly don't know why, I bought the car in November. I have fluid and pads waiting to go on, I just need to order my rotors and stainless lines. I noticed sometimes the front passenger side caliper would stick when I wouldn't roll back as easily on an incline. I came home and decided to spray my wheels with the hose the other day to clean them a bit and I noticed the aforementioned caliper/rotor let off quite a bit of steam when the water contacted it. Much more than the others.