NHTSA — Service Brakes, Hydraulic Problems


really awful
Crashes / Fires:
2 / 0
Injuries / Deaths:
1 / 0
Average Mileage:
24,668 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2004 Hummer H2 brakes problems

brakes problem

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2004 Hummer H2 Owner Comments

problem #6

Aug 012011


  • 76,000 miles


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.

- Castle Rock , WA, USA

problem #5

Jul 272010


  • 11,000 miles
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.

- Princeton Junction, NJ, USA

problem #4

Jan 032005


  • 11 miles
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.

- Portersville, PA, USA

problem #3

Jun 162004

H2 Diesel

  • Automatic transmission
  • miles


I was driving my 2004 H2 Hummer. I was on a deep slope hill. I was backing up and I hit a 500 series mercedez on his left bumper from left rear bumper. Immediately after I hit, I started to shift the gear so that I could stop the car to get out to see what happened. At this point, the Hummer started to travel at very fast speed down the street in the same pattern that I had originally driven up. I tried to apply the brakes, brakes did not work. I tried to steer, steering was in a lock position. I hit a pedestrian hard and my car landed in my neighbor's house. When I hit the house, the 2 front wheels became detached from the car. The pedestrian that I hit has incurred many serious damages. I had 1 engineering company look at the car back in 2004 after the accident and they said they could not find anything wrong. When I look now, I've heard of many cases where similar incidents have occurred due to brakes. I am currently in court for another 1 week as this pedestrian is now suing me. I plead to all H2 Hummer owners to contribute any information that they may have about other Hummer owners or their own experience. Your contribution to this matter is highly appreciated.

- Richmond , CA, USA

problem #2

Nov 202007

H2 4WD 8-cyl

  • Automatic transmission
  • 61,000 miles
The contact owns a 2004 Hummer H2. While driving 55 mph, the hydraulic service brakes became stiff and made it difficult to stop the vehicle. The contact also experienced steering failure, which nearly caused a crash. The Hummer manufacturer stated that his VIN was not included in NHTSA campaign id numbers 05V043000, 04V045000 and 06E010000. The purchase date was unknown. The current and failure mileages were 61,000.

- Victorville, CA, USA

problem #1

Jan 152005

H2 8-cyl

  • Automatic transmission
  • miles
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.

- Contoocook, NH, USA

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