NHTSA owner reports · September 18, 2026 snapshot.
Service Brakes, Hydraulic complaints
15 reportsClear category filter41,500 miles · Aug 24, 2011
Service Brakes, Hydraulic
TL* THE CONTACT OWNS A 2002 CHEVROLET C3500. THE CONTACT WAS DRIVING APPROXIMATLEY 25 MPH WHEN THE BRAKES WERE APPLIED AND THE PEDAL WENT TO THE FLOORBOARD WITHOUT THE VEHICLE STOPPING. THE CONTACT WAS ABLE TO COAST TO THE SIDE OF THE ROAD WITHOUT A CRASH. THE CONTACT CHECKED THE MASTER CYLINDER AND FOUND THAT THE BRAKE FLUID WA…
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TL* THE CONTACT OWNS A 2002 CHEVROLET C3500. THE CONTACT WAS DRIVING APPROXIMATLEY 25 MPH WHEN THE BRAKES WERE APPLIED AND THE PEDAL WENT TO THE FLOORBOARD WITHOUT THE VEHICLE STOPPING. THE CONTACT WAS ABLE TO COAST TO THE SIDE OF THE ROAD WITHOUT A CRASH. THE CONTACT CHECKED THE MASTER CYLINDER AND FOUND THAT THE BRAKE FLUID WAS DEPLETED AND HE COULD SEE BRAKE FLUID LEAKING FROM UNDER THE VEHICLE. THE FAILURE WAS CAUSED BY A RUPTURE OF ONE OF THE MASTER CYLINDER BRAKE LINES. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS 41,500.
NHTSA ODI #10421310
Mileage unknown · Jul 20, 2011
Service Brakes, Hydraulic
S10 APPROPRIATE HANDLING -COPY OF A LETTER TO THE PRESIDENT RE THE DANGERS OF RUPTURING BRAKE LINES ON A 2002 CHEVROLET SILVERADO 3500. *TGW THE CONSUMER STATED THE VEHICLE NEEDED FRONT BRAKE PADS, ROTORS WHICH WERE MORE RUSTED OUT THAN WORN AND ONE CALIPER. AS THE CONSUMER WAS BLEEDING THE AIR FROM THE HYDRAULIC CIRCUIT, HE …
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S10 APPROPRIATE HANDLING -COPY OF A LETTER TO THE PRESIDENT RE THE DANGERS OF RUPTURING BRAKE LINES ON A 2002 CHEVROLET SILVERADO 3500. *TGW THE CONSUMER STATED THE VEHICLE NEEDED FRONT BRAKE PADS, ROTORS WHICH WERE MORE RUSTED OUT THAN WORN AND ONE CALIPER. AS THE CONSUMER WAS BLEEDING THE AIR FROM THE HYDRAULIC CIRCUIT, HE NOTICED BRAKE FLUID POURING OUT OF THREE LOCATIONS ON THE DRIVER'S SIDE. THE STEEL BRAKE LINES HAD RUPTURED ON BOTH HYDRAULIC CIRCUITS DUE TO THE STEEL LINES RUSTING OUT. THE CONSUMER REPLACED ALL OF THE STEEL LINES, AS SOME OF THE RUST WAS HIDDEN FROM VIEW WITHIN PLASTIC RETAINERS. *JB
NHTSA ODI #10414353
80,000 miles · May 5, 2011
Service Brakes, Hydraulic
HUSBAND PERFORMED OIL CHANGE ON TRUCK. TRUCK IS DRIVEN INFREQUENTLY, ONLY USED FOR TOWING MY HORSE TRAILER, SO OIL IS ONLY CHANGED ABOUT ONCE A YEAR, AND TRUCK IS GARAGE KEPT. WHEN UNDERNEATH TRUCK, HUSBAND NOTICED THAT ALL BRAKE LINES FEEDING INTO THE ABS UNIT ARE SEVERELY CORRODED AND COULD FAIL AT ANY TIME. BASED ON CONDIT…
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HUSBAND PERFORMED OIL CHANGE ON TRUCK. TRUCK IS DRIVEN INFREQUENTLY, ONLY USED FOR TOWING MY HORSE TRAILER, SO OIL IS ONLY CHANGED ABOUT ONCE A YEAR, AND TRUCK IS GARAGE KEPT. WHEN UNDERNEATH TRUCK, HUSBAND NOTICED THAT ALL BRAKE LINES FEEDING INTO THE ABS UNIT ARE SEVERELY CORRODED AND COULD FAIL AT ANY TIME. BASED ON CONDITION OF BRAKE LINES, HUSBAND (A MECHANIC) FEELS ABS UNIT IS PROBABLY FULL OF RUST AS WELL. ENTIRE BRAKING SYSTEM MAY BE COMPROMISED AND FULL OF RUST. TRUCK WILL NOT BE SAFE TO DRIVE UNTIL BRAKE LINES ARE REPLACED, AND POTENTIALLY ENTIRE BRAKING SYSTEM IS OVERHAULED. CALLED DEALERSHIP, THEY REFUSED TO DO ANYTHING BECAUSE THE TRUCK IS OUT OF WARRANTY. WE HAVE CONTACTED CHEVROLET DIRECTLY AND ARE AWAITING A RETURN PHONE CALL. MY HUSBAND HAS 30 AND 40 YEAR OLD CARS AT HOME THAT HAVE CLEANER ORIGINAL BRAKE LINES THAN OUR 10 YEAR OLD TRUCK DOES.
NHTSA ODI #10400098
40,000 miles · Sep 28, 2010
Service Brakes, Hydraulic
ANTI-LOCK BRAKING SYSTEM CONSISTENTLY ENGAGES WHEN AT SLOW-SPEED STOPPING (5-8 MPH). PROBLEM STARTED AT THE 40,000 MILE MARK. DEALER INFORMED THAT THERE IS A RECALL ON THE ISSUE BUT MY VIN DOES NOT QUALIFY. *TR
NHTSA ODI #10357983
Mileage unknown · Feb 23, 2010
Service Brakes, HydraulicSteering
HYDRAULIC:ANTILOCK DURING LOW-SPEED BRAKE APPLICATIONS THE BRAKES PUSH BACK AND DON'T NOT STOP THE TRUCK THE POWER STEERING ALSO CUTS OUT WHEN THIS HAPPENS. *TR
NHTSA ODI #10313032
135,000 miles · Dec 22, 2009
Service Brakes, Hydraulic
TL* THE CONTACT OWNS A 2002 CHEVROLET SILVERADO 3500. THE FRONT BRAKE SENSOR HAS FAILED BECAUSE OF CORROSION. THE VEHICLE WAS TAKEN TO THE DEALER AND HE WAS ADVISED THAT SINCE THE WARRANTY EXPIRED NO ASSISTANCE WOULD BE PROVIDED. THE FAILURE MILEAGE WAS 135,000.
NHTSA ODI #10296662
56,000 miles · Aug 7, 2007
Service Brakes, Hydraulic
UNDER NORMAL BRAKING CONDITIONS THE ANTI LOCK BRAKING SYSTEM WILL ACTIVATE AT LOW SPEED, AROUND 7-10 MILES PER HOUR. CONTACTED LOCAL DEALER AND THEY TOLD ME IT WAS TYPICALLY THE WHEEL SPEED SENSOR THAT CAUSES THIS PROBLEM. THERE WAS A RECALL ISSUED BY GM BUT MY TRUCK DID NOT FALL IN THIS RECALL DUE TO THE VIN NUMBER. WHEEL SPEED…
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UNDER NORMAL BRAKING CONDITIONS THE ANTI LOCK BRAKING SYSTEM WILL ACTIVATE AT LOW SPEED, AROUND 7-10 MILES PER HOUR. CONTACTED LOCAL DEALER AND THEY TOLD ME IT WAS TYPICALLY THE WHEEL SPEED SENSOR THAT CAUSES THIS PROBLEM. THERE WAS A RECALL ISSUED BY GM BUT MY TRUCK DID NOT FALL IN THIS RECALL DUE TO THE VIN NUMBER. WHEEL SPEED SENSORS WERE REPLACED TO FIX THIS ISSUE. *JB
NHTSA ODI #10198697
30,000 miles · Mar 5, 2007
Parking BrakeService Brakes, HydraulicCrash
TL*- THE CONTACT STATED THAT WHEN THE PARKING BRAKE ON THE 2002 CHEVROLET SILVERADO 3500 WAS ENGAGED IT WOULD ONLY HOLD THE VEHICLE FOR A FEW SECONDS. THE CONTACT STATED THAT ONCE HE EXITED THE VEHICLE IT WOULD ROLL AWAY. THE CONTACT STATED THIS HAPPENED WHEN VEHICLE WAS PARKED ON A FLAT SURFACE OR A HILL. THIS CONTACT STATED …
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TL*- THE CONTACT STATED THAT WHEN THE PARKING BRAKE ON THE 2002 CHEVROLET SILVERADO 3500 WAS ENGAGED IT WOULD ONLY HOLD THE VEHICLE FOR A FEW SECONDS. THE CONTACT STATED THAT ONCE HE EXITED THE VEHICLE IT WOULD ROLL AWAY. THE CONTACT STATED THIS HAPPENED WHEN VEHICLE WAS PARKED ON A FLAT SURFACE OR A HILL. THIS CONTACT STATED THIS RESULTED IN NUMEROUS CRASHES. THE CURRENT AND FAILURE MILEAGE WAS 30000. THERE WAS A RECALL REPAIR COMPLETED FOR THIS PROBLEM; HOWEVER, THE PROBLEM RECURRED. THE CONTACT STATED THE ROTORS WERE PITTED AND RUSTED, WHICH MADE IT DIFFICULT TO STOP THE VEHICLE. THE DEALERSHIP INSPECTED VEHICLE. HOWEVER, DID NOT COME TO ANY CONCLUSION AS TO WHAT CAUSES THIS TO HAPPEN. THE DEALERSHIP REFUSED TO PERFORM ANY SERVICE ON THE VEHICLE. THE VEHICLE CURRENTLY HAS 30000 MILES. *AK
NHTSA ODI #10184224
19,000 miles · Oct 12, 2006
Service Brakes, Hydraulic
DT*: THE CONTACT STATED WHILE DRIVING 7 MPH ON NORMAL ROAD CONDITIONS, THERE WAS NO BRAKING ACTION WHEN TRYING TO STOP. NO WARNING LIGHTS WERE ILLUMINATED TO ALERT THE DRIVER. THE VEHICLE WAS TAKEN TO THE DEALERSHIP WHO INDICATED THE ANTILOCK BRAKE SYSTEM (ABS) HAD A RECALL # 05V379000 REGARDING SERVICE BRAKES, HYDRAULIC:ANTIL…
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DT*: THE CONTACT STATED WHILE DRIVING 7 MPH ON NORMAL ROAD CONDITIONS, THERE WAS NO BRAKING ACTION WHEN TRYING TO STOP. NO WARNING LIGHTS WERE ILLUMINATED TO ALERT THE DRIVER. THE VEHICLE WAS TAKEN TO THE DEALERSHIP WHO INDICATED THE ANTILOCK BRAKE SYSTEM (ABS) HAD A RECALL # 05V379000 REGARDING SERVICE BRAKES, HYDRAULIC:ANTILOCK, FOR THOSE VEHICLES DUE TO A SPEED SENSOR FAILURE. ALL VEHICLES OPERATED IN SALT BELT STATES MAY BE AFFECTED. THE MANUFACTURER WAS CONTACTED, AND INDICATED THE VEHICLE WAS NOT INCLUDED IN THE RECALL DUE TO THE VIN, AND THE COMPANY WAS NOT RESPONSIBLE FOR THE REPAIR COST. THE SPEED SENSOR, WHICH WAS THE AFFECTED COMPONENT OF THE ABS, WAS MANUFACTURED IN THE SAME PLANT FOR ALL GENERAL MOTORS VEHICLES. THE CONTACT EXPRESSED CONCERN BECAUSE A COPY OF THE COMPLAINT TAKEN BACK IN AUGUST WAS NEVER RECEIVED.
NHTSA ODI #10170679
19,500 miles · Sep 7, 2006
Service Brakes, Hydraulic
DT*: THE CONTACT STATED WHILE APPLYING BRAKE PRESSURE AT 10 MPH, THE ANTILOCK BRAKES ACTIVATED UNDER NORMAL CONDITIONS AND THERE WAS AN INCREASED STOPPING DISTANCE. THE VEHICLE WAS INSPECTED BY A DEALER WHO DETERMINED THE WHEEL SPEED SENSORS WERE CORROSIVE AND NEEDED TO BE REPLACED. THE VEHICLE WAS EXPOSED TO EXCESSIVE ROADS …
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DT*: THE CONTACT STATED WHILE APPLYING BRAKE PRESSURE AT 10 MPH, THE ANTILOCK BRAKES ACTIVATED UNDER NORMAL CONDITIONS AND THERE WAS AN INCREASED STOPPING DISTANCE. THE VEHICLE WAS INSPECTED BY A DEALER WHO DETERMINED THE WHEEL SPEED SENSORS WERE CORROSIVE AND NEEDED TO BE REPLACED. THE VEHICLE WAS EXPOSED TO EXCESSIVE ROADS SALTS DURING THE WINTER MONTHS. THERE WAS A NHTSA RECALL, # 05V379000, REGARDING THE ANTILOCK BRAKES. THE VEHICLE WAS NOT INCLUDED IN THE RECALL DUE TO THE VIN. THE MANUFACTURER WAS ALERTED.
NHTSA ODI #10167540
NHTSA investigations
2EA04012 · Hydraulic Pump Failres
Opened Apr 30, 2004 · Closed Feb 28, 2005
Status: closed (inferred from source dates) · Service Brakes, Hydraulic:power Assist; Steering:hydraulic Power Assist System
GM IS CONDUCTING A RECALL ON ALL SUBJECT VEHICLES BUILD BETWEEN MAY 1999 AND OCTOBER 14, 1999.SIGNIFICANT CHANGES WERE INCORPORATED INTO PRODUCTION IN EARLY OCTOBER 1999, AND VEHICLES BUILT AFTER THAT DATE HAVE LOWER WARRANTY FAILURE RATES.THE COMPLAINT AND WARRANTY DATA APPEAR TO SUPPORT THE EFFECTIVENESS OF THESE CHANGES. GM MADE ADDITIONAL CHANGES IN NOVEMBER 1999, FEBRUARY 2000, MAY 2001, AND FEBRUARY 2004.ODI WILL CONTINUE TO MONITOR THIS PROBLEM AND WILL TAKE FURTHER ACTION, IF WARRANTED, IN THE FUTURE.FOR FURTHER TECHNICAL DETAILS SEE THE ATTACHED ENGINEERING ANALYSIS REPORT.
Additional source detail variants (2)
Service Brakes, Hydraulic:power Assist
GM IS CONDUCTING A RECALL ON ALL SUBJECT VEHICLES BUILD BETWEEN MAY 1999 AND OCTOBER 14, 1999.SIGNIFICANT CHANGES WERE INCORPORATED INTO PRODUCTION IN EARLY OCTOBER 1999, AND VEHICLES BUILT AFTER THAT DATE HAVE LOWER WARRANTY FAILURE RATES.THE COMPLAINT AND WARRANTY DATA APPEAR TO SUPPORT THE EFFECTIVENESS OF THESE CHANGES. GM MADE ADDITIONAL CHANGES IN NOVEMBER 1999, FEBRUARY 2000, MAY 2001, AND FEBRUARY 2004.ODI WILL CONTINUE TO MONITOR THIS PROBLEM AND WILL TAKE FURTHER ACTION, IF WARRANTED, IN THE FUTURE.FOR FURTHER TECHNICAL DETAILS SEE THE ATTACHED ENGINEERING ANALYSIS REPORT.
Steering:hydraulic Power Assist System
GM IS CONDUCTING A RECALL ON ALL SUBJECT VEHICLES BUILD BETWEEN MAY 1999 AND OCTOBER 14, 1999.SIGNIFICANT CHANGES WERE INCORPORATED INTO PRODUCTION IN EARLY OCTOBER 1999, AND VEHICLES BUILT AFTER THAT DATE HAVE LOWER WARRANTY FAILURE RATES.THE COMPLAINT AND WARRANTY DATA APPEAR TO SUPPORT THE EFFECTIVENESS OF THESE CHANGES. GM MADE ADDITIONAL CHANGES IN NOVEMBER 1999, FEBRUARY 2000, MAY 2001, AND FEBRUARY 2004.ODI WILL CONTINUE TO MONITOR THIS PROBLEM AND WILL TAKE FURTHER ACTION, IF WARRANTED, IN THE FUTURE.FOR FURTHER TECHNICAL DETAILS SEE THE ATTACHED ENGINEERING ANALYSIS REPORT.
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.
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