I upgraded my brakes with SS lines, Dot4 fluid and powerslot rotors with Hawk HPS Street brake pads FRONT AND REAR, and I bled the brakes with special pressurized equipment. First few days the brakes were GREAT! At a 100MPH I would hit the brakes and they would lock up no problems! I loved it, brakes were nice and sharp. However now they are all mushy and I can hardy lock them up, which tells me there is not as much bite as before. The brake fluid is not boiled, and the pads are still good. Someone told me that it could be my master cylinder, any opinions on this?