NHTSA owner reports · September 18, 2026 snapshot.
What owners actually said
587 reports10,000 miles · Jan 13, 2005
Parking Brake
VEHICLE IS EXPERIENCING PROBLEMS WITH THE EMERGENCY BRAKES. THIS DEFECT OCCURRED SHORTLY AFTER THE VEHICLE WAS PURCHASED WITH JUST A FEW THOUSAND MILES. WHEN APPLYING THE EMERGENCY BRAKES, THEY WILL NOT HOLD THE VEHICLE IN POSITION. OWNER TOOK THE VEHICLE BACK TO THE DEALER WHERE A FEW ADJUSTMENTS WERE MADE BUT THE PROBLEM STILL…
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VEHICLE IS EXPERIENCING PROBLEMS WITH THE EMERGENCY BRAKES. THIS DEFECT OCCURRED SHORTLY AFTER THE VEHICLE WAS PURCHASED WITH JUST A FEW THOUSAND MILES. WHEN APPLYING THE EMERGENCY BRAKES, THEY WILL NOT HOLD THE VEHICLE IN POSITION. OWNER TOOK THE VEHICLE BACK TO THE DEALER WHERE A FEW ADJUSTMENTS WERE MADE BUT THE PROBLEM STILL OCCURS. PROVIDE FURTHER DETAILS. *NM
NHTSA ODI #10107317
7,500 miles · Jan 13, 2005
Parking Brake
VEHICLE IS EXPERIENCING PROBLEMS WITH THE EMERGENCY BRAKE. VEHICLE HAS BEEN EXPERIENCING THIS DEFECT SINCE IT WAS PURCHASED. OWNER HAS TAKEN THE VEHICLE BACK TO THE DEALER FOR A FEW ADJUSTMENTS. HOWEVER, THE PROBLEM STILL EXIST. PROVIDE FURTHER DETAILS. *NM
NHTSA ODI #10107303
103,000 miles · Jan 12, 2005
Engine And Engine CoolingPower Train
I AM WRITING TO CONVEY MY EXTREME DISAPPOINTMENT IN THE QUALITY OF CHEVROLET VEHICLES. WE OWN A 1999 CHEVROLET, TAHOE WHICH WE BOUGHT NEW. ON DECEMBER 24, 2002, OUR TRANSMISSION WENT OUT AT 103000 MILES. AS A RESULT, WE HAD TO HAVE A NEW TRANSMISSION INSTALLED AT A COST OF $2,646.72 PLUS THE COST OF RENTING A VEHICLE. WE DRIVE A…
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I AM WRITING TO CONVEY MY EXTREME DISAPPOINTMENT IN THE QUALITY OF CHEVROLET VEHICLES. WE OWN A 1999 CHEVROLET, TAHOE WHICH WE BOUGHT NEW. ON DECEMBER 24, 2002, OUR TRANSMISSION WENT OUT AT 103000 MILES. AS A RESULT, WE HAD TO HAVE A NEW TRANSMISSION INSTALLED AT A COST OF $2,646.72 PLUS THE COST OF RENTING A VEHICLE. WE DRIVE ABOUT 25,000 MILES PER YEAR. WE DO NOT DO ANY TOWING, WE DO NOT USE FOUR-WHEEL DRIVE EXCEPT IN THE WINTER, AND WE TAKE GOOD CARE OF OUR VEHICLE. SINCE THIS INCIDENT, THIS TRANSMISSION WE HAD REPLACED HAS FAILED AGAIN, FORTUNATELY ABOUT 2000 PRIOR TO ITS 50000 MILE WARRANTY. I AM STILL TRYING TO UNDERSTAND HOW THIS IS HAPPENING. WE DO NOT ABUSE OUR VEHICLE AND WE DRIVE LIKE ANY REGULAR PERSON DOES. OH YES, POOR ENGINEERING. FURTHERMORE, ABOUT A YEAR AGO, WE HAD TO REPLACE THE INTAKE MANIFOLD GASKET ON OUR ENGINE WHICH COST US $700. NOT ONLY THAT, WHEN WE TOOK THE TAHOE TO HAVE THE 2ND TRANSMISSION FIXED, I ASKED IF OUR CRACKED DOOR HANDLE WAS THE RESULT OF A BREAK-IN. THE TECHNICIAN CHUCKLED AND SAID THAT WAS COMMON. HE EVEN HAD THE AUDACITY TO BLAME IT ON THE CONSUMER FOR NOT USING THE DOOR HANDLE PROPERLY ACTUALLY SHOWING US HOW YOU HAD TO LIFT AND. SEEMS TO ME THAT THIS IS POOR ENGINEERING. I EVEN WENT SO FAR AS TO CONTACT SEVERAL CHEVROLET DEALERSHIPS WHO UNANIMOUSLY AGREED THAT A TRANSMISSION ON THESE VEHICLES SHOULD LAST AT LEAST 200,000 IF NOT THE LIFE OF THE VEHICLE. I?M NOT SURE WHAT ANYONE ELSE EXPECTS FROM THEIR VEHICLES, BUT WE DO NOT EXPECT A MAJOR COMPONENT, LIKE PART OF THE ENGINE, TO BLOW AT SUCH LOW MILEAGE. I DID MAKE MY VOICE HEARD BY WRITING A LETTER FOR THE 1ST TRANSMISSION THEY PUT IN, BUT ALL THEY COULD OFFER ME WAS $1000 LOYALTY VOUCHER TOWARDS THE PURCHASE OF A NEW GMC PRODUCT. IF THEY CAN'T MAKE GOOD ON MY FIRST GMC VEHICLE, THEN WHY WOULD I BUY ANOTHER? IN CLOSING, I NEED TO MAKE MY VOICE HEARD SO PEOPLE DON'T BUY GM PRODUCTS.*AK
NHTSA ODI #10106185
46,584 miles · Dec 30, 2004
Engine And Engine CoolingPower Train
I HAVE BEEN A LIFE-LONG GM OWNER. IN 1991 I OWNED A BUICK REGAL AND IN 1992 I OWNED A GMC JIMMY. BY THE LATE 1990'S I HAD OWNED A '93 BLAZER AND A ?94 C-1500. NEVER HAVE I HAD AS MUCH TROUBLE COLLECTIVELY WITH THESE FOUR VEHICLES AS I HAVE HAD WITH MY 1999 SILVERADO K-1500. IT BEGAN IN OCTOBER OF 2003 WHEN AFTER ONLY 46,584 M…
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I HAVE BEEN A LIFE-LONG GM OWNER. IN 1991 I OWNED A BUICK REGAL AND IN 1992 I OWNED A GMC JIMMY. BY THE LATE 1990'S I HAD OWNED A '93 BLAZER AND A ?94 C-1500. NEVER HAVE I HAD AS MUCH TROUBLE COLLECTIVELY WITH THESE FOUR VEHICLES AS I HAVE HAD WITH MY 1999 SILVERADO K-1500. IT BEGAN IN OCTOBER OF 2003 WHEN AFTER ONLY 46,584 MILES I HAD TO HAVE THE RIGHT AND LEFT HEAD GASKETS REPLACED DUE TO DETERIORATION OF THE GASKETS, WHICH TOTALED $989.47. THE LIFE-LONG MECHANIC THAT REPAIRED THE HEAD GASKET BELIEVES THAT THE GM/100,000 MILE ANTIFREEZE DETERIORATED THE GASKETS AND THEREFORE REPLACED IT WITH THE TIME-TESTED STANDARD GREEN ANTIFREEZE. I WAS WILLING TO OVERLOOK THIS PROBLEM BUT RIGHT BEFORE CHRISTMAS OF ?04 I HAD TO HAVE THE AUTOMATIC TRANSMISSION AND TORQUE CONVERTER COMPLETELY REBUILT DUE TO THE LOSS OF SECOND GEAR, FOURTH GEAR, AND REVERSE FOR THE TOTAL COST OF $1234.00. THE OWNER OF THE TRANSMISSION SHOP WAS ABLE TO DIAGNOSE THE PROBLEM INITIALLY OVER THE PHONE BECAUSE OF THE NUMEROUS OTHER GMC OR CHEVROLET TRANSMISSIONS HE HAS HAD TO OVERHAUL. I HAVE THE WORK -ORDER/RECEIPTS FOR BOTH JOBS COMPLETED.*AK
NHTSA ODI #10104815
40,000 miles · Dec 7, 2004
Service Brakes, Air
THE ABS WENT OUT ON MY 1999 CHEVROLET SIVERADO, DEALER STATES CAN'T KEEP PART ON SHELF(SO MANY GOING OUT). DEALER WANTS $1200 PLUS INSTALLATION. MANY FRIENDS HAVE SAME. 40,000 MILES AND WINTERS HERE, NOT SAFE TO LET MY WIFE DRIVE W/CHILDREN IN TRUCK. DRIVING WITHOUT ABS AT THIS TIME. *AK
NHTSA ODI #10102311
128,000 miles · Nov 9, 2004
Latches/locks/linkages
WHILE DRIVING AT 55 MPH REAR TAILGATE OPENED, AND THE GROCERY ITEMS FELL OUT ON THE HIGHWAY. THE ORIGINAL LATCH WAS REPLACED BY THE DEALERSHIP ABOUT THREE YEARS AGO. *AK CUSTOMER SERVICE ADVISED GM HAD NO REPONSIBILITY DUE TO MILAGE ON VEHICLE. *TC
NHTSA ODI #10094052
59,000 miles · Nov 1, 2004
Air BagsCrashInjury
1999 C1500 P/U HIT A VAN NEAR HEAD ON AT 50 MPH. DRIVER'S AIRBAG DID NOT DEPLOY (PASS. WAS SHUT OFF). TRUCK WAS DEMOLISHED.*AK
NHTSA ODI #10098099
72,000 miles · Oct 25, 2004
Structure
THE TAILGATE CABLES ARE RUSTING AND BREAKING IN HALF. THIS YEAR/MAKE AND MODEL IS NOT BEING RECALLED BY THE MANUFACTURER. HOWEVER, THE TAILGATE ON THIS VEHICLE IS MADE EXACTLY AS THOSE WHICH ARE BEING RECALLED. *AK
NHTSA ODI #10097639
48,000 miles · Oct 13, 2004
Service Brakes, Hydraulic
AT SPEEDS UNDER 7 MILES PER HOUR WHEN THE BRAKES ARE APPLIED THE ANTI-LOCK SYSTEM ENGAGES AND WILL NOT ALLOW THE BRAKES TO WORK (NO BRAKES WHATS SO EVER AND THE TRUCK KEEPS ROLLING WITHOUT ANY STOPPING EFFECTS AT ALL). *AK
NHTSA ODI #10095738
85,050 miles · Oct 10, 2004
Latches/locks/linkages
REAR TAILGATE LATCH ASSEMBLY- TAILGATE FELL WHILE I WAS SITTING ON IT. I COULD HAVE BEEN INJURED BUT WAS NOT. I HAD TO HAVE LATCH ASM. REPLACED AT A COST OF $80.58 AND CABLES BROKE ALSO AT A REPLACEMENT COST OF $46.49. *NM
NHTSA ODI #10093885
NHTSA investigations
2EA04011 · 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.
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