1989 GMC Sierra

OVER THE 12 YEAR PERIOD OF OWNERSHIP OF THIS PICKUP WE'VE EXPERIENCED 45 DIFFERENT SERIOUS BRAKING INCIDENTS. THEY ACTUALLY STARTED IN 7/13/89 AND THERE WAS WARRANTY WORK DONE. IN 1990 WE FIRST EXPERIENCED A BRAKING/ GLIDE /STOP INCIDENT THAT TOOK US PAST A STOP SIGN.TRUCK CENTER/HALL TRUCK CENTER DID SOME WARRANTY WORK ON THIS BRAKES ON 5/30/91 @48000. THEY LOST THE GMC PICKUP FRANCHISE. IN 1998 GM CUSTOMER SERVICE GAVE ME CLAIM # 98250220 AND SENT ME TO CURT WARNER BUICK GMC (NOW BELLEVUE BUICK GMC). I GOT GMC BRAKE SERVICE BULLETIN #905E69FROM YOUR AGENCY AND GAVE IT TO THESERV. MGR WHO THEN DROVE IT. HE COULDN'T DUPLICATE PROBLEMSDRIVING IT AND DID NOT PERFORM ANY DIAGNOSTIC TESTS..AND SAID HE COULD GET NO ACTION OR HELP FROM GMC. PURSUED AGAIN 5/30/00 WITH GMC CUSTOMER SERVICE..SENT BACK TO SAME DEALERSHIP LOCATION DIFFERENT NAME AND STAFF.ON 6/5/00 SUBMITTED LETTER WITH LOG OF INCIDENCES. SERVICE MGR SAYS GAVE DATA TO GMC REP WHO WILL CONTACT ME. SOFAR NO ACTION. AM NOT USING VEHICLE AND WON'T LET FAMILY USE. WANT TO SELL. FEEL IT IS UNSAFE. HAVE MUCH DOCUMENTATION AND SEVERAL WITNESSES TO SOME OF THESE BRAKE, GLIDE, STOP INCIDENTS AND SEVERAL REAR WHEEL LOCK UPS WHEN BRAKING. POTENTIALLY LOTS OF MORE MILEAGE AND USE. HEARD GM HAD OTHER SIMILAR PROBLEMS ON THESE MODELS. CAN YOU HELP ME GET ACTION TO GET THIS VEHICLE IN A SAFE CONDITION? *AK