SUDDEN UNEXPLAINED ACCELERATION AND BRAKE FAILURE ON MY 2004 TOYOTA SIENNA. I WAS ALMOST AT A STOP AT A TRAFFIC LIGHT WHEN THE LIGHT TURNED GREEN. I PRESSED THE ACCELERATOR. MY VAN SHOT OFF! IT ACCELERATED VERY RAPIDLY. I PRESSED THE BRAKE. THEY DID NOT ENGAGE. I PRESSED THE BRAKE AGAIN. THEY WENT TO FLOOR. WITH ONCOMING TRAFFIC ON MY LEFT AND A CAR IN THE RIGHT LANE, I HAD NOWHERE TO GO. I HIT THE TRUCK IN FRONT OF ME WHO WAS STOPPING AT THE NEXT TRAFFIC LIGHT. HAD I BEEN ON A CURVY ROAD OR THE INTERSTATE, I COULD HAVE BEEN SERIOUSLY INJURED. I DID NOT LOOK AT THE SPEEDOMETER TO SEE HOW FAST THE VAN GOT. I WAS TOO BUSY TRYING TO FIND A WAY NOT TO HIT SOMEONE. THIS WAS VERY SCARY. UPDATED 04/22/10 *BF UPDATED 05/10/10 *BF UPDATED IVOQ 05/12/10 UPDATED 09/28/10