WHEN ATTEMPTING TO STOP THE BRAKE FOR UPCOMING TRAFFIC THE BRAKE PEDAL WHEN TO THE FLOOR. TRIED PUMPING THE BRAKES AND THAT DID NO ACTIVATE THE BRAKING SYSTEM. RESULTING IN REAR ENDED A STOPPED VEHICLE AND PUSHING THAT VEHICLE INTO THE ONE IN FRONT. THERE WAS AMPLE ROOM TO STOP IF THE BRAKING SYSTEM HAD NOT FAILED. THE VEHICLE WAS RECIEVED ON GSA CONTRACT, IT ONLY HAD APPROXIMATELY 3200 MILES ON IT AND HAD NEVER BEEN SERVICED.*DT