iv got an 04 and if i press the break like normal, itl go to the floor. if I press the peddle quickly (not hard, jsut quick) i will have pressure and stop, but if i release even a little pressure on the peddle it will loose all pressure and go to the floor.

not loosing any fluid.

what gives?

 

It sounds like the brake master cylinder is defective.

 

that was it. the one i pulled had a bad sensor. so i pulled the one out of the original and just set it in the engine compartment. I think they are both bad.