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.
2004 Hummer H2 brakes problems
14 complaints (24% of all complaints for this car). Typical mileage when it fails: 76,000. 2 crashes reported.
- owner complaints
- 14
- of this car's complaints
- 24%
- typical mileage
- 76,000
- crashes
- 2
- recalls
- 2
Which part fails
Owners did not name a specific part.
At what mileage
Complaints by mileage at the time of the problem.
0k-25k
25k-50k
50k-75k
75k-100k
100k-125k
125k-150k
150k-175k
175k-200k
200k+
Hummer H2 brakes problems in other years
Related recalls
Service brakes, hydraulic
- What is wrong
- Certain trucks, sport utility vehicles, and vans equipped with bosch hydro-boost brake assemblies, the hydraulic brake booster pressure accumulator may crack and separate from the hydro-boost assembly during normal operating conditions.
- Risk
- If a separation occurred and the hood of the vehicle were open, fragments from the accumulator could cause injury to people in the immediate area. The presence of this crack or fractured surface could allow the hydraulic fluid to leak from the accumulator circuit of the booster assembly. The loss of fluid would cause increased steering and braking effort and a crash may occur without prior warning.
- Remedy
- Dealers will test the hydro-boost assembly for functional operation of the two-function valve. If the hydro-boost assembly fails the test, dealers will replace the assembly free of charge. The recall began on march 23, 2005. Owners may contact chevrolet at 1‑800‑630‑2438, gmc trucks at 1‑866‑996‑9463 and hummer at 1‑800‑732‑5493.
Recall number 05V043000 · Recall details
Service brakes, hydraulic
- What is wrong
- Certain sport utility vehicles, pickup trucks, and passenger vans fail to comply with the requirements of federal motor vehicle safety standard no. 135, ?passenger car brake systems.? Some of these vehicles were produced with an out-of-specification brake hydro-boost housing relief valve bore.
- Risk
- Consequently, the valve o-ring seal may fracture. Steering efforts may be slightly increased while braking or parking. Under certain driving conditions, a fractured seal may require a slight increase in the applied brake pedal effort to achieve the same vehicle deceleration rate as prior to the seat fracture.
- Remedy
- Dealers are to replace the hydro-boost relief valve. The recall began on june 18, 2004. Owners should contact cadillac at 1‑866‑982‑2339; chevrolet at 1‑800‑630‑2438; gmc at 1‑866‑996‑9463; or hummer at 1‑866‑486‑6376.
Recall number 04V045000 · Recall details
What 2004 Hummer H2 owners say
Most recent owner complaints, unedited.
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.
As I was driving on I 5 in oregon I experienced a complete failure of the electrical system and brake systems. The vehicle was on cruise control and when I disengaged it all of the safety warning light appeared on the dashboard. I pressed on the brakes and they were a complete failure also. At this time the dashboard lights and controls went off and I loss power. I was able to get to the side of the road when I noticed smoke coming from under the hood. I got my daughter out of the vehicle to a safe distance and opened the hood and the main fuse relay panel was fully engulfed in fire. I called 911. In the approx. 5 min. The time the fire truck arrived the truck was consumed and fully gutted out from the fire.
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.
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?
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.
Questions about the 2004 Hummer H2 brakes
Does the 2004 Hummer H2 have brakes problems?
Owners have filed 14 complaints about the brakes of the 2004 Hummer H2, 24% of all its complaints, more than any other problem.
At what mileage do 2004 Hummer H2 brakes problems start?
The typical (median) mileage in owner complaints is 76,000 miles.
Was there a recall on the 2004 Hummer H2 brakes?
Yes, 2 recalls: 05V043000, 04V045000. Check your VIN to see if your car still needs the free repair.
What year does the Hummer H2 have bad brakes?
The Hummer H2 model years with the most brakes complaints are 2003 (18 complaints), 2004 (14 complaints) and 2005 (11 complaints).
Other 2004 Hummer H2 problems
Electrical 14Visibility 13Steering 6Airbags 3Body 3Engine 3Suspension 3Driver assistance 2Transmission 2Acceleration 1Lights 1Locks 1Seat belts 1Seats 1Tires 1Wheels 1
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