PURCHASED 2000 TOYOTA TUNDRA IN 2004 WITH ABS LIGHT ON AND REAR END NOISE. TRUCK VIBRATES SIGNIFICANTLY WHEN BREAK IS USED DOWN HILL. TOYOTA AGREED TO INSPECT AND REPAIR IF ANY PROBLEM EXISTED. TOYOTA STATES THAT THE NOISE WAS A PARKING BRAKE CABLE AND THE BREAKS SHOULD BE USED "SMOOTHLY", TAKING CARE NOT TO HIT IT TOO HARD. THE DAY AFTER PICK UP FROM SERVICE DEPARTMENT A MAJOR ACCIDENT OCCURED WHEN AT 45 MPH THE BRAKES LOCKED UP CAUSING VEHICLE TO SLIDE 75 FEET IMPACTING TWO OTHER VEHICLES THAT WERE TOTALED OUT. THE TUNDRA REAR-ENDED A SMALL CAR. DAMMAGE WAS TO THE UPPER LEFT SIDE OF THE TUNDRA AND ALL THE WAY TO THE MIDDLE OF THE ENGINE AREA, AS THE TOP OF THE TUNDRA WAS FORCED INTO A DOWNWARD POSITION BY THE LEFT FRONT TIRE LOCKING UP. NO AIR BAG DEPLOYED. NOT THE DRIVER OR PASSENGER SIDE. 3 MINOR INJURIES TO 3 PEOPLE INSIDE TUNDRA. NECK INJURY TO DRIVER OF FIRST VEHICLE IMPACTED. TOYOTA VERBALLY STATED TO FAMILY MEMBER THAT THEY KNEW IT WAS A PROBLEM. BODY WORK FINNISHED AND INSURANCE PAID BILL. BREAKS STILL LOCK UP EVEN AT LOW SPEEDS. USING BREAKS ON A HILL CAUSE TRUCK TO SHAKE. BREAK PADS REPLACED AND BREAKS STILL DO NOT FUNCTION AS REQUIRED. TOYOTA DENIES ANY PROBLEM WITH BREAKS.