2021 GMC Acadia Brakes Problems
- Complaints
- 19about this part
- Share
- 12%of 155 total for the year
- Median mileage
- 26,000miles
- Trend
- FallingComplaints filed in the last 3 full calendar years are at least 25% lower than in the 3 years before.
NHTSA recorded 19 complaints about the brakes of the 2021 GMC Acadia, 12% of the 155 complaints for this model year. Where a mileage was given, the median is 26,000 miles. 1 of these say a crash was involved, according to the filers.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“I was driving and all of a sudden my break pedal was inoperable. It was stiff and unable to be used. Luckily I was only going 40 MPH. I pulled into a parking lot and my car started shaking and apparently the metal parts from the vacuum pump blew into my engine, which completely wrecked my engine. I nearly could have died and now my 2021 car is completely destroyed.”
NHTSA complaint #11743108, filed 2026-06“My brake pedal got stiff when I was driving. I had zero control of my brakes. I was informed by a GMC dealership that my BRAKE BOOSTER blew up causing my brakes to stop working and metal shrapnel to be sent into my engine. My 2021 vehicle is a complete loss. GMC has done NOTHING to help me.”
NHTSA complaint #11746671, filed 2026-06“I was driving down the road and all the sudden my breaks locked up. Like I had to stand on the break with both feet for it to barely stop. After getting it to the repair shop they said my vacuum pump exploded. My problem is it’s very well taken care of car and absolutely no warning light was on. I had no warning at all just all the sudden wouldn’t stop. Now I’m 7,600 in the hole because of this and very upset my not even 5 year old car is having these problems.”
NHTSA complaint #11658016, filed 2025-04“While driving the brake vacuum pump exploded leading to catastrophic brake failure. My husband was driving and was able to stand on the brakes to get the car to stop, but had i been driving, I am not strong enough to have stopped the car. I have 3 children with my youngest being 1. If this had happened with me and my kids, we could have had a major wreck and/or DIED! GM is aware of the brake vacuum pump issues but does not have a recall on the part. The braske assist light did not come on the dash until brakes were lost.”
NHTSA complaint #11759335, filed 2026-08“On March 27, 2026, I experienced a complete brake failure while driving a 2021 GMC Acadia in a school zone at approximately 3:00 PM. When I pressed the brake pedal, the vehicle did not respond. I attempted multiple times, including using the emergency brake, which did not activate immediately. The vehicle remained in motion for several minutes in an area with children and parents present. The emergency brake only engaged after approximately 30–45 seconds of repeated attempts. I was forced to steer off the road to avoid a collision. …”
NHTSA complaint #11728151, filed 2026-03Related service bulletins
- 11017508Apr 3, 2025This service bulletin provides a procedure to add deadener to the batter tray bracket to correct customer concerns of a Service Engine Soon (SES), Reduced Power, Service Brake…
- 11017173Mar 21, 2025This informational bulletin instructs the tech when fuel/fluid is needed to be tested and where it can be sent for analysis.
- 11014230Jan 31, 2025This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
- 11012931Jan 9, 2025This technical bulletin provides repair information to correct a customer concern of hearing front brake grind/groan noise after sitting overnight.
- 11011990Nov 26, 2024This service bulletin provides a procedure to clean the back side of the rims and rotors and to correct the customer concern of wheel clicking.
- 11011709Nov 5, 2024This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
Brakes: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2026 | 1 | 10% |
| 2025 | 41 | 59% |
| 2024 | 25 | 41% |
| 2023 | 4 | 8% |
| 2022 | 3 | 6% |
| 2021 | 19 | 12% |
| 2020 | 8 | 8% |
| 2019 | 17 | 4% |
| 2018 | 22 | 6% |
| 2017 | 36 | 5% |
| 2016 | 4 | 2% |
| 2015 | 6 | 2% |
| 2014 | 9 | 2% |
| 2013 | 3 | 2% |
| 2012 | 8 | 3% |
| 2011 | 10 | 4% |
| 2010 | 5 | 1% |
| 2009 | 3 | 1% |
| 2008 | 31 | 4% |
| 2007 | 10 | 2% |
Other parts of the 2021 GMC Acadia
39 complaintsEngine
30 complaintsFuel system
30 complaintsOther or unknown
22 complaintsSteering
18 complaintsTransmission and drivetrain
17 complaintsAir bags
10 complaintsBack-over prevention (rear camera)
7 complaintsForward collision avoidance
7 complaintsVehicle speed control
7 complaintsLane departure
4 complaintsEngine cooling
3 complaints
← All problems reported for the 2021 GMC Acadia
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 28, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology