Ok so I finally installed the Power Pack 3 to the GT and when parked I decided to Rev the engine to like 4000 rpm or so what was strange was that when I apply the throttle the brake pedal was moving up when I stopped the brake pedal moved down. I did full service of the car including brake fluid at my local dealer who also installed the Power Pack 3. Brakes feel great though but for the past year or so I'm chasing a random hard pedal on track. I was thinking brake pads but now I start to think brake booster check valve. Any inside will be helpful.