IllustrationNO BRAKES! PEDAL TO THE FLOOR. RUSTED BRAKE LINES. *JS
2002 GMC Sierra 2500
Owner reports · Recalls · Investigations
More warning signs than most Sierra 2500 years
Owner complaints for the 2002 GMC Sierra 2500 are substantially higher than the model-year median of 46.
About this comparison →How this year compares
Owner complaints by model year
Compare all Sierra 2500 years →Counts vary with age, sales and reporting. They are not failure rates.
What owners reported most
All reported categories
Tap a category to read its complaints. One report may name several components.
When problems were reported
Mileage at the reported incident
110–25K
1525–50K
2450–75K
1975–100K
30100–150K
15150K+
114 reports with mileage · 20 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 44 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Service Brakes. Review the 32 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Power Train. Review the 14 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
10 crash reports1 fire reports5 injury reports
Service Brakes complaints
32 reportsTHE PEDAL WENT ALL THE WAY TO THE FLOOR, AND I MISSED THE TURN I WAS TRYING TO MAKE. I ROLLED TO A STOP. I WALKED TO A SERVICE STATION. I WAS INFORMED THAT ALL BRAKE LINES WERE CORRODED AND HAD TO BE REPLACED. ALL LINES, HOSES, AND CALIPERS WERE REPLACED AT A COST OF $1800.00. *TR
TL* THE CONTACT OWNS A 2002 GMC SIERRA 2500 HD. THE CONTACT STATED THAT WHILE DRIVING 20 MPH, THE BRAKES FAILED WITHOUT WARNING. THE VEHICLE WAS NOT REPAIRED AND THE MANUFACTURER WAS NOT NOTIFIED. THE APPROXIMATE FAILURE MILEAGE WAS 123,000. *TR
I WAS EXITING MY DRIVEWAY, WHICH IS VERY STEEP,THE BRAKE PEDAL WENT TO THE FLOOR WITH NO WARNING,LAMPS OR OTHERWISE. MY VEHICLE SURGED ACROSS BOTH LANES AND WOUND UP IN THE WOODS. *TR
VEHICLE IS A 2002 GMC HD 2500 PICKUP TRUCK WITH A DURAMAX DIESEL ENGINE, AND 5 SPEED ALLISON TRANSMISSION WHILE DRIVING ON SURFACE STREETS, THE POWER BRAKES AND STEERING BOTH WENT OUT SIMULTANEOUSLY. STOPPING REQUIRED BOTH FEET ON PEDAL, AND STEERING WAS NEARLY IMPOSSIBLE. PROBLEM TRACED TO THE "HYDROBOOST" AND THE POWER STEE…
Read full complaint
VEHICLE IS A 2002 GMC HD 2500 PICKUP TRUCK WITH A DURAMAX DIESEL ENGINE, AND 5 SPEED ALLISON TRANSMISSION WHILE DRIVING ON SURFACE STREETS, THE POWER BRAKES AND STEERING BOTH WENT OUT SIMULTANEOUSLY. STOPPING REQUIRED BOTH FEET ON PEDAL, AND STEERING WAS NEARLY IMPOSSIBLE. PROBLEM TRACED TO THE "HYDROBOOST" AND THE POWER STEERING PUMP. BOTH WERE REPLACED ALONG WITH THE HIGH PRESSURE HOSE. EVIDENTLY, THE PUMP FAILED TO YIELD ANY BOOST PRESSURE, WHICH IN TURN RENDERED POWER STEELING AND BRAKES INOPERATIVE. A VERY DANGEROUS SITUATION. THE TOW TRUCK THAT RESPONDED INDICATED THAT THEY HAVE HAD MULTIPLE FAILURES OF THE SAME ITEMS (87 OT 8 GMC HD TRUCKS) AND IN BLOGS WITH OTHER GMC/CHEVY DIESEL OWNERS IT APPEARS TO BE A COMMON DEFECT. THERE WERE NO NOISES, OR OTHER INDICATOR OF PENDING PROBLEMS. CONTACT WITH THE DEALER REVEALED THAT " I SHOULD CHANGE THE PS FLUID EVERY 2 YEARS: (NOT IN THE MAINTENANCE SECTION OF OWNER MANUAL). *TR
THE TRUCK WOULD NOT STOP AT STOP SIGN AND THE BRAKE GOES CLEAR TO THE FLOOR BEFORE SLOWS TO A STOP. *TR
A BRAKE LINE RUPTURED CAUSING LOSS OF STOPPING POWER. TRUCK WAS NOT ABLE TO SLOW ENOUGH TO MAKE ORIGINALLY-PLANNED TURN. TRUCK WAS SAFELY RETURNED HOME USING EMERGENCY BRAKE AND ENGINE BRAKING. UPON INSPECTION, A LEAKING BRAKE LINE WAS FOUND BETWEEN THE MASTER CYLINDER AND ABS MODULE. ALL BRAKE LINES WERE FOUND TO BE SEVEREL…
Read full complaint
A BRAKE LINE RUPTURED CAUSING LOSS OF STOPPING POWER. TRUCK WAS NOT ABLE TO SLOW ENOUGH TO MAKE ORIGINALLY-PLANNED TURN. TRUCK WAS SAFELY RETURNED HOME USING EMERGENCY BRAKE AND ENGINE BRAKING. UPON INSPECTION, A LEAKING BRAKE LINE WAS FOUND BETWEEN THE MASTER CYLINDER AND ABS MODULE. ALL BRAKE LINES WERE FOUND TO BE SEVERELY CORRODED. NO WARNING LIGHTS ILLUMINATED ON THE DASH. *TR
I HAD AN UNEXPECTED BRAKE FAILURE CAUSED BY THE RUST THROUGH OF THE BRAKE LINE UNDER THE DRIVER SEAT. IT WAS FORTUNATE THAT I WAS IN A PARKING LOT AND GOING AT A SLOW SPEED AT THE TIME. I HAD TO REPLACE THE ENTIRE BRAKE LINE SYSTEM AS THERE WAS RUST ON ALL THE LINES. THE REPAIR COST WAS $741.89. I HAVE HAD OTHER GM VEHICLES,…
Read full complaint
I HAD AN UNEXPECTED BRAKE FAILURE CAUSED BY THE RUST THROUGH OF THE BRAKE LINE UNDER THE DRIVER SEAT. IT WAS FORTUNATE THAT I WAS IN A PARKING LOT AND GOING AT A SLOW SPEED AT THE TIME. I HAD TO REPLACE THE ENTIRE BRAKE LINE SYSTEM AS THERE WAS RUST ON ALL THE LINES. THE REPAIR COST WAS $741.89. I HAVE HAD OTHER GM VEHICLES, AND HAVE NEVER EXPERIENCED THIS TYPE OF FAILURE BEFORE. *TR
WAS TRAVELING ON A STRAIGHT STRETCH OF ROAD APPROACHING A RED LIGHT. AS I ATTEMPTED TO APPLY THE BRAKES THE BRAKE PEDAL WENT STRAIGHT TO THE FLOOR - THE VEHICLE WOULD NOT STOP. I THEN DROPPED THE TRANSMISSION FROM "D" OR DRIVE TO "L1", ENGAGED THE "TOW SETTING" OF THE TRANSMISSION, AND APPLIED THE PARKING BRAKES WHILE MAINTAININ…
Read full complaint
WAS TRAVELING ON A STRAIGHT STRETCH OF ROAD APPROACHING A RED LIGHT. AS I ATTEMPTED TO APPLY THE BRAKES THE BRAKE PEDAL WENT STRAIGHT TO THE FLOOR - THE VEHICLE WOULD NOT STOP. I THEN DROPPED THE TRANSMISSION FROM "D" OR DRIVE TO "L1", ENGAGED THE "TOW SETTING" OF THE TRANSMISSION, AND APPLIED THE PARKING BRAKES WHILE MAINTAINING THE PARKING DISENGAGEMENT LEVER IN THE "UP" POSITION IN ORDER TO STOP THE TRUCK. THE BRAKES FAILED. GM DEALERSHIP CONFIRMED THAT THE BRAKE LINES HAD RUSTED THROUGH. THE ENTIRE BRAKE SYSTEM FROZE IN PLACE RESULTING IN THE REPLACEMENT OF THE LINES, ROTORS, DISCS. *TR
I WAS DRIVING MY 2002 GMC SIERRA 2500 HD ON I95 WHEN TRAFFIC CAME TO A SUDDEN STOP. I SLAMMED ON THE BRAKES AT WHICH POINT THE ABS SYSTEM STARTED PULSING THE BRAKES, BUT THE BRAKE PEDAL SUDDENLY WENT TO THE FLOOR WITH NO FURTHER BRAKE RESPONSE. THANKFULLY, THE BRAKES SLOWED THE TRUCK ENOUGH PRIOR TO FAILURE TO PREVENT A COLLIS…
Read full complaint
I WAS DRIVING MY 2002 GMC SIERRA 2500 HD ON I95 WHEN TRAFFIC CAME TO A SUDDEN STOP. I SLAMMED ON THE BRAKES AT WHICH POINT THE ABS SYSTEM STARTED PULSING THE BRAKES, BUT THE BRAKE PEDAL SUDDENLY WENT TO THE FLOOR WITH NO FURTHER BRAKE RESPONSE. THANKFULLY, THE BRAKES SLOWED THE TRUCK ENOUGH PRIOR TO FAILURE TO PREVENT A COLLISION AT 65 MPH. I HIT THE CAR IN FRONT OF ME AT ~5-10 MPH, CAUSING BUMPER DAMAGE TO MY TRUCK AND THE CAR IN FRONT OF ME. I WAS ABLE TO GET THE CAR TO THE SIDE OF THE ROAD AND TO MY HORROR I HAD NO BRAKES. THE VEHICLE WAS TOWED TO A LOCAL AUTHORIZED GMC DEALER WHO HAS MAINTAINED THE TRUCK FOR ME. THEY CONFIRMED THAT THE BRAKE LINES CATASTROPHICALLY FAILED WHEN I SLAMMED ON THE BRAKES. THE RUSTED BRAKE LINES BURST WHEN I SLAMMED ON THE BRAKES. THEY INDICATED THAT ALL OF THE BRAKE LINES HAD TO BE REPLACED DO TO RUST THROUGHOUT. I CAN'T BELIEVE I HAVE BEEN DRIVING THIS TRUCK AROUND WITH A PENDING CATASTROPHIC BRAKE FAILURE WITHOUT WARNING FROM GM OR THE SERVICING DEALER. IF THE WORD IS NOT PUT OUT TO OWNERS OF AFFECTED GMC TRUCK, LIVES WILL BE LOST. I SHUDDER TO THINK WHAT COULD HAVE HAPPENED IF I HAD BEEN PULLING UP TO A PEDESTRIAN FILLED CROSSWALK WHEN THE FAILURE OCCURRED. UPDATED 10/03/12*LJ *TR
Official recalls
101V220000 · Interior Lighting
Jun 26, 2001
VEHICLE DESCRIPTION: CERTAIN PICKUP TRUCKS EQUIPPED WITH 6.6L DIESEL ENGINES FAIL TO COMPLY WITH REQUIREMENTS OF FMVSS NO. 105, "HYDRAULIC AND ELECTRIC BRAKE SYSTEMS." THESE VEHICLES HAVE A BRAKE SYSTEM WARNING LIGHT IN THE INSTRUMENT CLUSTER THAT MAY NOT ILLUMINATE WHEN THE BRAKE FLUID IS LOW. IN ADDITION, WHEN THE BRAKE FLUID IS LOW, THE VEHICLE MAY NOT MEET THE PARTIAL SYSTEM REQUIREMENTS OF FMVSS NO. 105.
Consequence & remedy
Consequence: THESE CONDITIONS COULD RESULT IN REDUCED BRAKING CAPABILITY, WHICH COULD LEAD TO A CRASH.
Remedy: DEALERS WILL CHANGE THE LOCATION OF A WIRE CONNECTION IN THE UNDERHOOD BUSSED ELECTRICAL CENTER. OWNER NOTIFICATION BEGAN JULY 9, 2001. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT CHEVROLET AT 1-800-222-1020 OR GMC AT 1-800-462-8782.
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
3EA07013 · Trailer Hitch Receiver Failure
Opened Sep 14, 2007 · Closed Sep 12, 2008
Status: closed (inferred from source dates) · Trailer Hitches
COMPLAINT REPORTS ALLEGE POOR WELD QUALITY AND/OR BENDING OF THE SUBJECT VEHICLE ORIGINAL EQUIPMENT TRAILER HITCH RECEIVER.THE AGENCY'S INVESTIGATION INCLUDED ANALYSIS OF MANUFACTURER AND AGENCY INCIDENT REPORTS, REVIEW OF POLICE REPORTS, ANALYSIS OF THE AGENCY'S FATAL ANALYSIS REPORTING SYSTEM, A VEHICLE OWNER SURVEY, INSPECTION OF TOW VEHICLES/HITCHES AND ANALYSIS OF FAILED PARTS.INCIDENTS OF WELD FAILURE WERE RARE AND ASSOCIATED WITH VERY LOW-SPEED DRIVING (TURNING, BACKING AND SUDDEN STOPPING).INCIDENTS OF BENDING WERE ASSOCIATED WITH IMPROPER TRAILER HITCH ADJUSTMENT OR OVERLOADING. A SAFETY-RELATED DEFECT HAS NOT BEEN IDENTIFIED AT THIS TIME AND FURTHER USE OF AGENCY RESOURCES DOES NOT APPEAR TO BE WARRANTED.ACCORDINGLY, THIS INVESTIGATION IS CLOSED.THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY NHTSA THAT A SAFETY-RELATED DEFECT DOES NOT EXIST.THE AGENCY WILL MONITOR THIS ISSUE AND RESERVES THE RIGHT TO TAKE FURTHER ACTION IF WARRANTED BY THE CIRCUMSTANCES.SEE DOCUMENT SEARCH FILE FOR ADDITION INFORMATION.
PE07025 · Trailer Hitch Receiver Failure
Opened May 14, 2007 · Closed Sep 14, 2007
Status: closed (inferred from source dates) · Trailer Hitches
GM PROVIDED ADDITIONAL DATA REGARDING ALLEGATIONS OF FAILURE OF THE TRAILER HITCH.ODI REVIEWED THAT AS WELL AS OTHER DATA PROVIDED BY PEER MANUFACTURERS.BASED ON OUR REVIEW, ODI FINDS THE NEED TO FURTHER INVESTIGATE THIS ISSUE.THIS PRELIMINARY EVALUATION IS UPGRADED TO AN ENGINEERING ANALYSIS (EA07-013) FOR FURTHER ASSESSMENT AND STUDY OF THIS ISSUE.
PE04004 · Hydraulic Pump Shaft Failures
Opened Jan 8, 2004 · Closed Apr 30, 2004
Status: closed (inferred from source dates) · Service Brakes, Hydraulic; Service Brakes, Hydraulic:power Assist; Service Brakes, Hydraulic:power Assist:hydraulic; Steering:hydraulic Power Assist System; Steering:hydraulic Power Assist:pump
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Additional source detail variants (5)
Service Brakes, Hydraulic
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Service Brakes, Hydraulic:power Assist
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Service Brakes, Hydraulic:power Assist:hydraulic
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Steering:hydraulic Power Assist:pump
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Steering:hydraulic Power Assist System
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.