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1999 GMC Sierra 1500

Owner reports · Recalls · Investigations

Similar to other model years

Owner complaints for the 1999 GMC Sierra 1500 do not stand out strongly from the model-year median of 181.

About this comparison →

When problems were reported

Mileage at the reported incident

130 reports with mileage · 28 unknown

NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.

What to inspect

Issues worth paying extra attention to based on owner reports.

  • Service Brakes, Hydraulic. Review the 70 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Service Brakes. Review the 30 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Seats. Review the 10 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →

NHTSA owner reports · September 18, 2026 snapshot.

9 crash reports0 fire reports2 injury reports

Suspension complaints

7 reports
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186,000 miles · Mar 9, 2017
Suspension

TL* THE CONTACT OWNS A 1999 GMC SIERRA 1500. THE CONTACT STATED THAT THE VEHICLE MADE AN ABNORMAL GRINDING SOUND FROM THE REAR END AFTER HITTING A POTHOLE. THE VEHICLE WAS TAKEN TO THE DEALER WHERE IT WAS DIAGNOSED THAT THE REAR DIFFERENTIAL WAS DEFECTIVE AND NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED, BUT THE FAILURE RECUR…

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TL* THE CONTACT OWNS A 1999 GMC SIERRA 1500. THE CONTACT STATED THAT THE VEHICLE MADE AN ABNORMAL GRINDING SOUND FROM THE REAR END AFTER HITTING A POTHOLE. THE VEHICLE WAS TAKEN TO THE DEALER WHERE IT WAS DIAGNOSED THAT THE REAR DIFFERENTIAL WAS DEFECTIVE AND NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED, BUT THE FAILURE RECURRED. THE REAR DIFFERENTIAL WAS REPLACED FOUR TIMES. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS APPROXIMATELY 186,000.

NHTSA ODI #10959740

150,000 miles · Oct 27, 2014
Service BrakesSuspension

COMING TO A STOP SIGN I APPLIED THE BRAKES AND THEY COMPLETELY FAILED WITHOUT WARNING; NO LIGHTS OR INDICATION FAILURE WAS IMMINENT. THE PEDAL WENT TO THE FLOOR WITH NO RESISTANCE. MANAGED TO TURN ONTO A DIRT SHOULDER AND DOWNSHIFT TO STOP. INSPECTION REVEALED RUSTED THROUGH REAR BRAKE LINE. ALTHOUGH THE DASH BRAKE WARNING LIGH…

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COMING TO A STOP SIGN I APPLIED THE BRAKES AND THEY COMPLETELY FAILED WITHOUT WARNING; NO LIGHTS OR INDICATION FAILURE WAS IMMINENT. THE PEDAL WENT TO THE FLOOR WITH NO RESISTANCE. MANAGED TO TURN ONTO A DIRT SHOULDER AND DOWNSHIFT TO STOP. INSPECTION REVEALED RUSTED THROUGH REAR BRAKE LINE. ALTHOUGH THE DASH BRAKE WARNING LIGHT COMES ON WHILE STARTING THE TRUCK, IT GOES OFF AND GIVES NO INDICATION THE BRAKE FLUID IS LOW. WHILE REPAIRING THE BRAKE LINES IT WAS NOTICED THE FRAME OF THE TRUCK IS EXTREMELY RUSTY AND FLAKING. AFTER WIRE-BRUSHING BY HAND,THE FRAME IS SHOWING CRACKS ON BOTH SIDES, UNDER THE CAB, NEAR THE REAR, RIGHT ABOUT WHERE A CROSSMEMBER IS ATTACHED. THIS VEHICLE IS NO LONGER SAFE TO DRIVE. I AM NOT IMPRESSED WITH GM'S CLAIM THAT THIS WAS A LIGHTER, STRONGER FRAME ON THIS TRUCK. WE HAVE 2 OLDER TRUCKS WITH NOWHERE NEAR THIS MUCH RUST AND NEITHER HAVE CRACKED. THE DESIGN ALLOWS TOO MUCH CRUD TO ACCUMULATE INSIDE THE LIP OF THE FRAME WHERE IT IS ALMOST IMPOSSIBLE TO WASH OUT. *TR

NHTSA ODI #10650532

120,000 miles · Jun 11, 2013
Power TrainStructureSuspension

FRAME ROTTED,SUSPENSION ROTTED,FRONT SUSPENSION LOCK TOTALLY ROTTED. *TR

NHTSA ODI #10519370

180,000 miles · Apr 28, 2012
StructureSuspension

I HAVE SEVERE FRAME RUST TO THE POINT WHERE THE FRAME HAS A CRACK HALFWAY AROUND IT NEAR THE REAR SUSPENSION. THE FACTORY MOUNTED TOW HITCH LITERALLY BROKE COMPLETELY OFF OF THE FRAME DUE TO THE AMOUNT OF RUST THAT WAS BUILT UP AROUND THE WELDS WHILE I WAS TOWING MY CAMPER, LUCKILY I HAD JUST MADE IT HOME FROM A TRIP FROM CAMPIN…

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I HAVE SEVERE FRAME RUST TO THE POINT WHERE THE FRAME HAS A CRACK HALFWAY AROUND IT NEAR THE REAR SUSPENSION. THE FACTORY MOUNTED TOW HITCH LITERALLY BROKE COMPLETELY OFF OF THE FRAME DUE TO THE AMOUNT OF RUST THAT WAS BUILT UP AROUND THE WELDS WHILE I WAS TOWING MY CAMPER, LUCKILY I HAD JUST MADE IT HOME FROM A TRIP FROM CAMPING WHEN THIS OCCURRED. I CAN LITERALLY PEEL OFF 1/8" THICK PIECES OF RUST AT A TIME, THE TRUCK IS NO LONGER OPERABLE DUE TO THE SAFETY ASPECT, I HAVE NEVER SEEN RUST LIKE THIS ON ANY VEHICLE, EVEN ONES THAT HAVE BEEN AROUND THE OCEAN AND SALT, AFTER READING MANY COMPLAINTS ABOUT THE SAME ISSUES WITH THESE PARTICULAR MODEL AND YEAR TRUCKS RANGING FROM 1999-CURRENT I HAVE DECIDED TO FILE A COMPLAINT, MAYBE IF YOUR ADMINISTRATION GETS ENOUGH OF THESE COMPLAINTS SOMETHING CAN BE DONE TO CORRECT THE ISSUE AND HOPEFULLY GM WILL DO SOMETHING TO COMPENSATE SO MANY OF THEIR DISAPPOINTED CUSTOMERS OR BETTER YET FIX THE ISSUE, THIS WILL BE THE LAST GM TRUCK I PURCHASE DUE TO THEIR NEGLIGENCE AND AFTER READING 100'S OF COMPLAINTS OF THE SAME ISSUE GM DOESN'T SEEM TO CARE THEY JUST GIVE THE RUN AROUND JUST LIKE WHEN I HAVE HAD PROBLEMS WITH MY VEHICLES IN THE PAST UNDER WARRANTY. *TR

NHTSA ODI #10456746

59,617 miles · Apr 16, 2010
Suspension

TL*THE CONTACT 1999 GMC SIERRA 1500. WHILE DRIVING 10 MPH THE BRAKES WERE APPLIED BUT THE VEHICLE DID NOT STOP UNTIL REPEATED PRESSURE AND THE EMERGENCY BRAKE WAS APPLIED. THE VEHICLE WAS TAKEN TO AN AUTHORIZED GMC DEALER AND THE LEFT FRONT HUB ASSEMBLY WAS REPLACED. THE FAILURE DID NOT RECUR. THE FAILURE MILEAGE WAS 59,617 A…

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TL*THE CONTACT 1999 GMC SIERRA 1500. WHILE DRIVING 10 MPH THE BRAKES WERE APPLIED BUT THE VEHICLE DID NOT STOP UNTIL REPEATED PRESSURE AND THE EMERGENCY BRAKE WAS APPLIED. THE VEHICLE WAS TAKEN TO AN AUTHORIZED GMC DEALER AND THE LEFT FRONT HUB ASSEMBLY WAS REPLACED. THE FAILURE DID NOT RECUR. THE FAILURE MILEAGE WAS 59,617 AND THE CURRENT MILEAGE WAS 127,000.

NHTSA ODI #10325956

Mileage unknown · Aug 29, 2007
Suspension

TL*THE CONTACT OWNS A 1999 GMC SIERRA 1500. THE CONTACT STATED THAT THE WHEELS LOCKED UP AND THE VEHICLE WOBBLES SEVERELY. THE DEALER CHANGED THE HUB AND THE WHEEL BEARING. THE SPEED AND FAILURE MILEAGE WERE UNKNOWN. THE CURRENT MILEAGE WAS 210,000.

NHTSA ODI #10201104

Mileage unknown · Jun 9, 2000
Engine And Engine CoolingSuspension

1. WHEN GOING OVER MINOR BUMPS CONSUMER CAN HEAR REAR LEAF SPRINGS HIT AGAINST EACH OTHER, METAL TO METAL SOUND; 2. WHEN ACCELERATING, CONSUMER CAN HEAR A VALVE NOISE. *AK *ML

NHTSA ODI #863309

Official recalls

1

00V122000 · Seat Belts:front:webbing

Apr 27, 2000

VEHICLE DESCRIPTION: LIGHT DUTY PICKUP TRUCKS AND SPORT UTILITY VEHICLES. THESE VEHICLES DO NOT COMPLY WITH THE OCCUPANT PROTECTION REQUIREMENTS OF FMVSS NO. 208, "OCCUPANT CRASH PROTECTION."

Consequence & remedy

Consequence: IN THE EVENT OF A VEHICLE CRASH, THE RIGHT FRONT PASSENGER RESTRAINT SYSTEMS MAY NOT MEET THE NECK EXTENSION REQUIREMENTS.

Remedy: DEALERS WILL INSTALL A TRAY INSERT ON THE TOP OF THE PASSENGER SIDE OF THE INSTRUMENT PANEL. THE TRAY INSERT CORRECTS THE NONCOMPLIANCE.

Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗

NHTSA investigations

2

EA04011 · Parking Brake Failure

Opened Apr 9, 2004 · Closed May 10, 2005

Status: closed (inferred from source dates) · Parking Brake; Parking Brake:conventional; Parking Brake:conventional:mechanical; Parking Brake:conventional:mechanical:linkage And Cable

IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.

Additional source detail variants (4)

Parking Brake:conventional

IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.

Parking Brake:conventional:mechanical

IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.

Parking Brake:conventional:mechanical:linkage And Cable

IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.

Parking Brake

IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.

PE03057 · Parking Brake Failure

Opened Dec 8, 2003 · Closed Apr 9, 2004

Status: closed (inferred from source dates) · Parking Brake

ODI OPENED PE03-057 TO ASSESS PARKING BRAKE INEFFECTIVENESS IN THE SUBJECT VEHICLES.THESE VEHICLES ARE EQUIPPED WITH FOUR WHEEL DISC BRAKES THAT INCORPORATE A SINGLE-SHOE DRUM-IN-HAT PARKING BRAKE INDEPENDENT OF THE SERVICE BRAKES.COMPLAINT AND WARRANTY DATA INDICATE THAT THE PARKING BRAKE LININGS TEND TO WEAR OUT EARLY IN THE LIFE OF THE VEHICLE (AT AN AVERAGE OF 24 MONTHS IN SERVICE), REDUCING THE PARKING BRAKE SYSTEM'S TORQUE BELOW THAT NEEDED TO IMMOBILIZE THE VEHICLE.GM HAS ATTRIBUTED THIS ACCELERATED WEAR TO FOREIGN MATERIAL INTRUSION AND A FAILURE OF THE BRAKE SHOE TO PROPERLY SELF-CENTER WITHIN ITS BRAKE DRUM.EFFECTIVE WITH THE START OF MY 2003 PRODUCTION, A NEWER REDUCED FORCE HOLD-DOWN CLIP WAS INTRODUCED TO FACILITATE BRAKE SHOE DISENGAGEMENT FROM THE DRUM SURFACE.THIS PART IS ALSO AVAILABLE AT THE SERVICE LEVEL FOR THE MY 1999-2002 VEHICLES.GM HAS INDICATED THAT THE PAKING BRAKE IS INTENDED TO OPERATE IN CONJUNCTION WITH THE TRANSMISSION TO IMMOBILZE PARKED VEHICLES, AND THAT IN MANY CASES, ACCELERATED PARKING BRAKE LINING WEAR IS CAUSED BY ROUGH USE, VEHICLE MODIFICATIONS, AND DRIVING WITH THE PARKING ENGAGED. ODI HAS UPGRADED THE PRELIMINARY EVALUATION TO AN ENGINEERING ANALYSIS TO GATHER FURTHER INFORMATION CONCERNING PARKING BRAKE USAGE FACTORS AND THE CIRCUMSTANCES SURROUNDING THE SEVENTEEN REPORTED VEHICLE CRASHES.