Brake pedal to the floor

[wawa]

Hello

Boxster S 2000 with 138 000km. Brake have been done in spring (all disc and pad, nothing else)
Coming back from work today, had to brake hard! No ABS and the pedal goes all the way to the floor. The wheel scream a bit. Scare the hell out of me and stop only 1 foot from other car. Re-accelerate a bit, brake and the pedal goes back to the floor barely braking. I was jam in trafic, good thing for once, so I was able to get back home at about 15mph max.

I got brake a little but as soon I push the pedal too firmly, it goes to the floor.
Brake fluid look like in between min and max.

What could be the problem?

thanks
wawa