2025 GMC Acadia service brakes problems

“On October 23, 2026 at about 7:25 AM, while my wife was driving our leased 2025 GMC Acadia (20,773 miles) with our son in the car, the vehicle displayed 'Brake assist failure. Press hard to brake. Speed limited.' The ABS and traction control warning lights came on and the brake pedal became very hard to press due to loss of brake assist. No crash or injuries occurred. This failure matches the eBoost electronic brake control module issue under NHTSA Engineering Analysis EA26006 covering 2024-2026 GMC Acadia. My wife is afraid to drive the vehicle. The vehicle is currently at the dealer for repair. I am requesting that NHTSA record this incident and that GM be required to remedy this safety defect and release us from the lease.”

“I was driving my car and my brakes felt weird. Then warning lights came on and my car told me that my brakes weren’t working and I would need to push them hard to stop. I put on my hazard lights and turned into a side street and was able to safely stop in the parking lane next to the curb. I shut my car off and then turned it back on. At that point, everything looked normal except for the engine light was on. I started driving again and within less than five minutes, the brakes went out again. I again was able to make it to a side street and stop, but was in a no parking zone. I was able to slowly make it into a parking lot and safely into a spot.”

“While driving my 2025 GMC Acadia, the vehicle experienced a sudden and severe failure of the brake master cylinder assembly, causing a significant loss of hydraulic pressure and braking assistance. Multiple dashboard warnings illuminated simultaneously, including ABS and brake system alerts. The brake pedal feel altered abruptly, drastically increasing the required stopping distance and creating an immediate collision hazard. The vehicle is currently grounded at a certified GM dealership awaiting a total replacement of the defective master cylinder assembly under factory warranty. Mileage at the time of failure was 19,000.”

“Dropping my children off at school, 4 lights came on on the dash. Two messages came across my dash as well. Service esc service abs. EBCM master cylinder needed to be replaced at local GMC dealership.My brakes were failing…This is a known safety issue by GMC and there’s no recall!”

“I was driving my 2025 GMC Acadia Denali on [XXX] with cruise on. Suddenly sound and banner notifications were telling me that I had no brakes. I immediately hit brake to break cruise and vehicle went faster. I managed to get cruise off from steering wheel. Put flashers on and took foot completely off gas. I was very fortunate that I didn’t hit someone or that no one hit me. After about 2 miles, I was able to pull in an empty church parking lot and get stopped. After getting stopped I was 2.4 miles from [XXX]. I was towed to GMC dealership in Montgomery, AL and diagnosed with defective master cylinder and no brakes. Very concerned because GMC has not issued a recall because the master cylinder failure has occurred many times before.”

“Today, June 11, 2026, my wife and 9 month old baby were on their way home from running errands in town when the vehicle started to violently shake, becoming frightened my wife tried to apply pressure to the brakes. When she pushed down on the brake pedal nothing happened and the pedal hit the floor. Our brand new 2025 GMC Acadia AT4 had just suffered catastrophic brake failure. So she pulled off onto the side of the road in hopes the uneven terrain would slow her down just enough to put it into park. Luckily enough it did. If it would have been 10 seconds later she would have been on a one way bridge where the speed limit is 60mph with no brakes. Four days prior to today on June 07, 2026 I sent a message to the individual that I bought the car from at the GMC dealership and told him that we had warning lights come up on the dash. He had me try and reset the screen but nothing happened. I asked when we could get it into a shop so it could be looked at he said that he would have someone reach out and schedule a time. I proceeded to ask if we were ok to drive the vehicle until then.To which he responded "If the vehicle isn't giving you issues mechanically, you…”