In the past 3-4 days I have noticed a change in the way my Model S feels whenever I get in it when it's parked and I turn it on by pressing the brake pedal. It's the feel of the brake pedal that has changed. I have owned the car since Aug of 2013, and every single time I have ever started the car I have put my foot on the brake pedal and the pedal has had only some resistance -- it goes down pretty far. But in the past few days, when I get in the car to go somewhere, I put my foot on the pedal and it is HARD, the resistance is really harsh, and I feel like I have to actually PUSH the brake pedal a little bit to go from "Car Off" to the car being on. Anyone ever noticed this in their car? What does it mean? Why the sudden change? I only have ~5700mi on the car by the way.