2001 TUNDRA BRAKES FAILED TO STOP TRUCK FROM HITTING VEHICLE IN FRONT ON A SUDDEN STOP ON THE INTERSTATE. FOUND OUT LATER THAT TOYOTA KNEW OF DEFECTIVE BRAKES AND ISSUED TSB BR004-002 TO REPLACE 191MM FRONT BRAKE CALIPERS WITH LARGER 231 MM CALIPERS WITHIN THE WARRANTY PERIOD, BUT DID NOT NOTIFY OWNERS OF THE DEFECT. ONLY OWNERS WHO COMPLAINED OF VIBRATION WHEN BRAKING AND EARLY FAILURE OF FRONT ROTORS AND BRAKE PADS WERE OFFERED THE UPGRADED CALIPERS, BUT ONLY AFTER REPEATED COMPLAINTS. THE UPGRADED CALIPERS WERE EVENTUALLY INCORPORATED INTO THE 2004 AND LATER TUNDRAS. *TR