I was driving down a hill and hit my brakes and the pushed back against me and then went right to the floor with minimal braking. I got an error message on my dash that said -??brake system failure- do not exceed 62 mph-?? Luckily it was early in the morning and nobody was in front of me. All of the lights were green and between the engine braking and the little brake power that I had I made it up the hill (about a mile) to the Chevy dealership. I got an error notification the day prior that said there was an electrical error and my check engine light came in. I drove straight to the dealership but they couldn-??t do anything since it was 4:30 and later than work hours so they made me an appointment for the next day and let me go. They told me later that day that it was an issue with the master cylinder (which with some research I found that there is an active lawsuit against this issue) I was issued a loaner vehicle with a crack straight across the entire windshield (it was all they had available and I was told it would be -??okay-?? so I-??m fine with that)

- Earlysville, VA, USA

On the day of purchase, while driving on a freeway, the vehicle would not accelerate. The RPM's went up, the engine revved, but the vehicle acted as if it was in neutral. These vehicles will not accelerate if they think the brake pedal is also being pressed. The brake was not being depressed. As I was pulling the vehicle to the side of the road, suddenly it allowed me to accelerate again, and I continued with no further issues. One week later, with fewer than 200 miles on the vehicle, upon starting the dashboard showed alerts to Service ESC, Service Brake Assist, Service Trailer Brake System. The ABS and Traction Control lights also came on. These are all systems designed to prevent loss of control, and all failed without warning. A dealer service center diagnosed this as a known problem with a faulty master cylinder, on several models built over a period of several months.

- Fort Worth, TX, USA

Many warning lights are on for traction control, abs, brakes service ESC, trailer braking and the adaptive cruise control system is not working, it was reported to the dealer, they checked it said bad battery, they coded it out said it is fine now on 9/5/25. It-??s back at the dealer with all the same warnings on again

- Pinecity , MN, USA

[XXX] I purchased a 2025 Chevrolet Colorado zr2 Midnight Edition from Preston Hood Chevrolet in Crestview, Florida. I had been waiting to see this truck for a couple days as it was listed on their website. They said it was in service but when I asked why they did not tell me. When I went to the dealership to buy it I asked again why it had been in service and the salesman said he did not know but he said this truck has a lot of accessories they had to put on it. I drove the truck home, and then to work the next day and in my way home the brake system completely failed. I kept pushing fully on the brakes and it kept going and took quite some time to stop. I noticed multiple brake warnings and was stranded on a very busy street with cars flying by. This was not a safe area. When I called the dealership I asked point blank if the brakes was the reason I was unable to see the truck for the days I was waiting to purchase it and he said yes. The car was towed to a close by chevy dealership. (Sandy sansing chevrolet) and My husband drove me back to Preston Hood ( the selling dealership) And explained that I would never feel safe in that truck again as the incident scared me more than anything I can remember. I wanted my trade in back and the deal reversed primarily because they lied to me about why the truck was in the service department. I would have never considered purchasing a vehicle with brake issues. I asked for the prior service records and they had already changed the master cylinder and other items. The next day after many phone calls they finally gave me my trade back. I am not reporting for any personal gain, only to help keep someone else from getting killed by this obvious KNOWN issue with this truck. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Pensacola, FL, USA

This truck was purchased May 2025 and currently has 2600 miles. Without any warning the brake light and ABS warning lights came on along with messages reading Brake Assist, ESC, and Trailer Brake require service. I took my truck in to a Chevrolet dealer on Aug 18, 2025 for inspection of issue. I was informed the Master Cylinder has failed and because this was a -??SAFETY-?? issue I could not take drive my truck and they would not allow me to remove the vehicle from their lot. I understand there has been many people with this same issue. Why has a recall not been issued" Why is Chevrolet still selling these trucks" This needs to be addressed ASAP to save lives.

- Oak Ridge, TN, USA

Started the vehicle and 4 dash lights were on. The ABS light, the forward collision system light, the BRAKE light, and the traction control light. The vehicle was taken to a dealership and we have been notified by the dealer that it is a Master Brake Cylinder failure. The part is on national backorder with no ETA. Luckily, it did not fail while driving, but could've been tragic. This vehicle is brand new and belongs to my 16 year old. This is a known issue on the Colorado, Traverse, and possibly other models. However, I have yet to find a recall or TSB. Brake cylinders are FAILING in brand new vehicles and GM needs to address it.

- Decatur, IL, USA

Brake pedal went to the floor when I applied the brakes, took truck to dealership. Dealership reported to me the master clylinder was defective and needed to order one from detroit.

- Venice, FL, USA