There are 11 owner-reported brakes complaints for the 2004 Hummer H2in NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
TL* THE CONTACT OWNS A 2004 HUMMER H2. WHILE DRIVING APPROXIMATELY 25 MPH, THE BRAKE PEDAL WAS DEPRESSED AND TRAVELED TO THE FLOORBOARD. THE STOPPING DISTANCE WAS EXTENDED. WHILE EXAMINING THE VEHICLE, THE CONTACT NOTICED BRAKE FLUID LEAKING UNDER THE SUBFRAME. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS NOTIFIED. THE LOCAL DEALER WAS NOT CONTACTED. THE FAILURE MILEAGE WAS 160,000.
RIGHT FRONT BRAKE HOSE RUBBING ON WHEEL AND CUTTING LOSS OF FLUID AND BRAKING EFFETENESS WAS MOVING IN DRIVEWAY WHEN IT POPPED THE MILEAGE IS 29236
BRAKES LINES UNDER VEHICLE HAVE EXCESSIVE CORROSION AND HAVE FINALLY CRACKED, RESULTING IN COMPLETE BRAKE FAILURE. EVENT DID NOT RESULT IN ACCIDENT. VEHICLE HAS NOT BEEN OPERATED IN A NORTHERN SNOW REGION NOR COASTAL AREA.
MY 2004 H2 HAS A SERIOUS RUSTING ISSUE WITH THE BRAKE LINES. ON 2 SEPARATE OCCASIONS I HAVE BEEN DRIVING ALONG AT APPROXIMATELY 30 MPG AND HIT THE BRAKES ONLY TO HAVE THEM GO ALL THE WAY TO THE FLOOR. LUCKILY I DID NOT AN ACCIDENT. IN BOTH OCCASIONS THE LINE BURST DUE TO RUST. MY VEH. HAS 103,000.00 LIGHTLY DRIVEN. GM NEEDS TO COME OUT AND ADMIT THEY HAVE A PROBLEM WITH RUSTING BRAKE LIENS BEFORE SOMEONE GETS KILLED
I WAS PULLING OUT OF MY DRIVEWAY IN MY HUMMER H2 WHEN THE BRAKE PEDAL WENT TO THE FLOOR. I GOT OUT OF MY H2 AND NOTICED A LARGE AMOUNT OF BRAKE FLUID RUNNING OUT FROM UNDER THE REAR END NEAR THE LEFT REAR WHEEL. I LOOKED UNDER THE VEHICLE AND NOTICED A BRAKE LINE WAS RUSTED IN TWO. I CHECKED UNDER THE HOOD AND SAW THAT THE BRAKE FLUID RESERVOIR WAS COMPLETELY EMPTY. *TR
I WAS TRAVELING ON NJ TURNPIKE WHEN MY BRAKES DIDN'T FEEL RIGHT. ALMOST NO BRAKES STEPPING TO FLOOR. THEN BRAKE FAILURE LIGHT CAME ON. THIS IS A GARAGE KEPT VEHICLE WITH APPROX 14000 ORIGINAL MILES. APPEARS BRAKE LINES ARE CORRODED. ONE OWNER. HOW COULD THIS HAPPEN. IS THERE A RECALL HOW CAN I OBTAIN DETAILS FOR FULL RECOVERY OR REIMBURSEMENT? *TR
TL* THE CONTACT OWNS A 2004 HUMMER H2. THE CONTACT STATED THAT WHILE DRIVING APPROXIMATELY 35 MPH, THE BRAKE PEDAL FAILED TO RESPOND WHEN DEPRESSED REPEATEDLY. THE VEHICLE WAS DRIVEN UPHILL IN COMBINATION OF THE EMERGENCY BRAKE BEING ENGAGED IN AN ATTEMPT TO STOP THE VEHICLE. THE VEHICLE WAS TOWED TO AN INDEPENDENT MECHANIC WHERE THE BRAKE POWER BOOSTER WAS REPLACED. IN ADDITION, THE MASTER CYLINDER AND BRAKE LINES WERE REPLACED AT DIFFERENT TIMES. THE MANUFACTURER WAS NOTIFIED OF THE DEFECT. THE APPROXIMATE FAILURE MILEAGE WAS 71,000.
TL* THE CONTACT OWNS A 2004 HUMMER H2. THE CONTACT STATED THAT THE VEHICLE WAS EQUIPPED TO ACCOMMODATE TRAILER BRAKES BUT THE TRAILER BRAKES WOULD NOT ENGAGE AND CAUSED THE OFFROAD LIGHT TO ILLUMINATE. THE VEHICLE WAS NOT TAKEN TO THE DEALER TO BE DIAGNOSED OR REPAIRED. THE VIN WAS NOT AVAILABLE. THE FAILURE AND THE CURRENT MILEAGE WAS 76,000.
EXTREMELY EXCESSIVE RUST ON UNDERBODY OF MY 2004 HUMMER H2. BRAKE LINES, CALIPERS, ROTORS, FRAME, SUSPENSION, ETC HAVE HOLES. MY BRAKES COMPLETELY FAILED ON THE HIGHWAY AND I CRASHED INTO A TRUCK AND A SUV. LUCKILY USED THE EMERGENCY BRAKE TO EVENTUALLY STOP IT. DEALER SAYS ENTIRE BRAKE SYSTEM NEEDS TO BE REPLACED AND THE FRAME IS ALSO IN BAD SHAPE. I DID REPORT THE RUST PROBLEM TO GM WHILE UNDER THE 3 YEAR WARRANTY BUT THEY DID NOTHING. I NEITHER DO ANY CROSS-COUNTRY DRIVING NOR AM NEAR THE OCEAN. I AM SCARED OF DRIVING THE VEHICLE. *TR
DT: 2004 GMC HUMMER THE CONSUMER STATES HE HAD TO MAKE AN EMERGENCY STOP AND THE BRAKES WENT ALMOST TO THE FLOOR. THE VEHICLE WAS TAKEN TO THE DEALERSHIP AND THEY COULD NOT FIND ANYTHING WRONG WITH IT. THE CONSUMER TRIED TO DUPLICATE THE PROBLEM HIMSELF AND IT DID THE SAME THING AGAIN. HE FEELS IT WILL NOT STOP IN TIME DURING AN EMERGENCY. THE MANUFACTURER TOLD THE CONSUMER TO TAKE THE VEHICLE TO THE DEALERSHIP. THIS ALMOST CAUSED AN ACCIDENT. THE BRAKES FAIL EVERY TIME THE CONSUMER NEEDS TO MAKE AN EMERGENCY STOP. *NM
DISC BRAKE ROTORS NOT MACHINED TO LEGAL SPECIFICATIONS. APPROXIMATELY 40% OF ROTORS FACE WERE STILL ROUGH CASTING, THIS CAUSED ROUGH BRAKING AND EARLY BRAKE PAD FAILURE. DEALER AND GM REFUSED TO REPAIR UNDER WARRANTY, CLAIMED THEY WERE OK. I WILL NOT BUY ANOTHER GM PRODUCT FOR THEIR LACK OF CONCERN. STATE INSPECTION REQUIRES 100% CLEAN UP OF MACHINED SURFACE ON ROTORS. *TR
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026