I own a STR6 convertible with only 7000 miles. The vehicle has been sitting awhile uncover in storage. I decided to start it up the other day and take it for a drive when I noticed the brake pedal went straight to the floor. I could pump the pedal rapid and get a little braking but after the pedal would go straight to the floor. I did notice though with the engine not running I would have brake pressure near the top. Only with the engine running did I lose all brake pressure. I have NO LEAKS whatsoever. Any advice is greatly appreciate.