I HAVE A 2007 FORD F 350 SUPER DUTY. I HAVE BEEN HAVING TROUBLE WITH THE BRAKES GIVING OUT OCCASIONALLY.  ALL OF A SUDDEN MY FOOT WHILE DRIVING AND WANTING TO BRAKE- MY FOOT WILL BRING THE BRAKE ALL THE WAY TO THE FLOOR WITH NO RESISTANCE.  I HAVE HAD THE TRUCK AT FORD NUMEROUS TIMES BUT THEY CAN'T FIND THE PROBLEM. HAS ANY ONE HAD A SIMILAR PROBLEM? I KNOW F 150 HAD BRAKE PROBLEMS. I THINK THESE HAVE PROBLEMS TOO BUT FORD WILL NOT ACKNOWLEDGE. HOPE SOMEONE CAN ADVISE.

CMARCELL@AOL.COM  

I would get the brake system completely flushed, and put in braided steel lines at all four corner. That should probably get you a little better response. If that doesn't work, look at getting the master cylinder or vacuum booster repaired or replaced. Hope this helps.