I STOPPED A THE LIGHT WITH NO ISSUE AND ONCE TRAFFIC BEGIN TO MOVE THE CAR IN FRONT OF ME PLACED THEIR FOOT ON BRAKES AT ABOUT 20-25. IN THE MIDDLE OF THE NEXT BLOCK AND I DID AS WELL BUT THE BRAKES DID NOTHING BUT WENT STRAIGHT TO THE FLOOR. MY FOOT IS ALL THE WAY DOWN AND STILL NO STOPPING. I HIT THE CAR IN FRONT OF ME AND AS SHE MOVED TO THE LEFT MY TRUCK WAS STILL IN MOTION AND ENDED UP HITTING THE CAR IN FRONT OF HER AS WELL WHICH IS WHAT ACTUALLY STOPPED MY TRUCK. THE AIRBAGS ALSO NEVER DEPLOYED IN THE TRUCK. THE WERE THANKFULLY NO PHYSICAL INJURIES BUT DAMAGE TO THE CARS I HIT AS WELL AS MY OWN. THIS WAS A MECHANICAL FAILURE THAT COULD HAVE BEEN DEADLY HAD I BEEN ON THE EXPRESSWAY WHERE I WAS INDEED HEADED.