Okay so this has been happening alot, after driving around a lot my brake pedal will COMPLETELY go all the way down and my brakes will not engage. It made me crash that other day, lol, I reversed and attempted to brake and no go, so I hit a small wall, bumper has a few scuffs on it, anyways... I've bled the brakes, brake pads are new, rotors are okay... Thinking the Master Cylinder and Booster, but I really doubt the Booster. Does it sound like the MC?