TRUCK WAS IN MOTION (STRAIGHT LANE) ON DRY PAVEMENT STREET. DRIVER PUSHED ON BRAKES TO STOP AND NOTHING HAPPENED. TRUCK KEPT MOVING FORWARD AND HIT A STOPPED CAR WAITING AT A RED LIGHT. AFTER IMPACT, THE TRUCK WAS DRIVEN TO THE CURB AND WAS ABLE TO COME TO A COMPLETE STOP WITH THE BRAKES.