Break lines on an 04 F150?

We were driving down the road and went to stop and the peddle hit the floor. After looking at the Tuck there is Break fluid all over the side of the bed starting at the rear tire. I changed the front breaks about 2-3 weeks ago no issues till Friday.|||Hey gal i am a mech and from what u say it seems that the break lines must have hit a leak. this prob can be changed without strain and aint gonna cost u much. this might have happened as the work on the brakes were done there might have been a crack in the brake oil pipe most probably or container and that when u hit the brake the last time the pressure being intence the pipe or container would have given away to the pressure.|||DEALER...STILL UNDER WARRANTY? INSPECT CALIPER AND BRAKE HOSE ON SUSPECTED SIDE. BRAKE LINES DON%26#039;T RUPTURE/BREAK UNLESS SOMETHING COMES IN CONTACT WITH THEM.