Yeah, there are no leaks. That was checked many times. Here's a few things that I was thinking of but they are kind of "grasping at straws" type ideas.

- Would a hairline crack in the master cylinder fluid reservoir cap allow air in over time (2 weeks) & cause the pedal to go soft?

- Am I potentially braking too hard boiling the fluid? Would this cause the fluid to go off? I'm not that hard on the brakes, at least I think so anyway.

- The pedal stays good for about a week or two,so am I correct in saying that the flexible brake lines & pads/discs should not be to blame?

:@ Very frustrated.

Thanks for the replies so far.