Brakes have failed now three separate times. The brake pedal becomes firm and the car will not stop or slow at all. I am pregnant and also had my toddler in the car with me. No warning symbols on the dash. Taken to dealership after several weeks of communication saying this was a safety issue and received a loaner vehicle. However, they have said if THEY cannot reproduce the issue, we will just…
2025 GMC Acadia brakes problems
moderate 30 complaints filed with NHTSA · avg repair $450 · see brakes across all vehicles →
Complaints
30
Recalls
0
Avg fix
$450
1crash
What stands out
Of the 11 model years of GMC Acadia we track for brakes problems, this one carries the most owner complaints on file — 30.
Brakes accounts for 52% of every owner complaint on file for this vehicle — the dominant problem area across 5 categories tracked.
The failure pattern owners describe
Buyer takeaway: Steer clear of the 2025 GMC Acadia until GM resolves widespread brake master cylinder failures occurring under 9,000 miles—some owners report complete brake loss at highway speeds, multiple repeated failures after part replacement, and critical parts backordered indefinitely. Dealerships have no ETA for repairs and explicitly state many of these vehicles are unsafe to drive.
Owners of 2025 GMC Acadia models report a serious, recurring brake system defect centered on master cylinder failure. The problem shows up early—typically before 10,000 miles, with some failures occurring as low as 336 miles and 800 miles. The first sign is usually a dashboard warning for "Service Brake Assist" accompanied by ABS and ESC warnings; brakes then either fail completely or become unresponsive, requiring maximum pedal pressure or emergency maneuvers to stop.
What makes this defect especially troubling: replacement doesn't fix it. One owner's master cylinder failed three times in succession—first at 6,945 miles, then 7 miles after the dealer's replacement, then 11 miles after a second replacement. Another owner reports the replacement cylinder also failed. A highway incident involved a 60 mph brake failure; another involved inability to stop while backing out of a parking space.
The parts supply problem compounds the issue. Master cylinders and related components (reservoir, seals, Electronic Brake Control Modules) are on nationwide backorder. Dealers report no ETA—some repairs have been pending 2+ months with vehicles remaining unsafe to drive. Owners also report conflicting information from dealers (vehicle is safe to drive) versus the owner's manual (brake light lit means do not drive). One owner notes pending class-action litigation and reports GM halted 2026 Acadia, Traverse, and Enclave sales.
Same GMC Acadia brakes reports on nearby years: 2024
Failure modes owners describe
Master Brake Cylinder Failure
Defective master cylinder assembly causing loss of brake hydraulic pressure and brake assist functionality. Owners report the part fails repeatedly even after replacement, and is chronically on backorder nationwide with no available ETAs for repair.
When: Typically under 9,000 miles; one owner reported failure at 336 miles, another at 800 miles, another at 5,600 miles. Failures documented from April through August 2025 models.
Symptoms owners cite: Brake pedal goes firm or becomes unresponsive; Brakes fail to slow or stop vehicle despite full pedal pressure; Service Brake Assist warning light illuminates; Check Engine light illuminates; Multiple dashboard warning lights (ABS, ESC, traction control, collision warning); Brake light indicator on dashboard
Codes mentioned: Service Brake Assist, Service ESC, Check Engine, ABS warning, Electronic Stability Control failure
Repairs/costs cited: Dealership replacement of master cylinder assembly and EBCM; however, replacement cylinders fail repeatedly within days (7–11 miles after first replacement in one case). Many owners report parts remain on backorder for 2+ months with no ETA. Some repairs include reservoir and seal replacement also on backorder.
Recalls/TSBs owners mention: Dealers advise vehicle is not safe to drive. Some owners mention pending class-action lawsuits. GM reportedly aware of issue and investigating. 2026 Acadia, Traverse, and Enclave sales stopped per one owner claim.
Complete Brake System Failure While Driving
Sudden total loss of braking power at highway speeds with no prior warning, requiring foot-to-floor braking effort and emergency maneuvers to avoid collisions. One incident involved near rear-end collision at 60 mph; another involved backing into a building. No warning lights appeared before failure in these cases.
When: One incident at 800 miles (new vehicle); one at 60 mph highway driving; one during backing maneuver in parking lot.
Symptoms owners cite: Complete loss of brake response; Brake pedal pressed to floor with no effect; Brakes go to floor when applied; Vehicle cannot slow or stop despite maximum braking effort; Warning lights appear only after brake failure occurs (Service Brake Assist, Service ESC); Electric brake failure message and speed limited message appear
Codes mentioned: Brake system failure, Electric brake failure, Service ESC, Speed limited
Repairs/costs cited: Vehicles towed to dealership; one owner reports diagnosis pending insurance and GMC inspection at time of complaint. Brake system described as requiring diagnostic machine evaluation.
Recurring Master Cylinder Failures After Replacement
Master cylinder replacement fails to resolve the problem. One owner reports cylinder failure three times in sequence (initial failure at 6,945 miles, second failure 7 miles after replacement, third failure 11 miles after second replacement). Another owner reports replacement cylinder failed and a second replacement attempt was needed.
When: Failures recur within 7–11 miles of replacement; initial failures occur under 7,100 miles on original cylinder.
Symptoms owners cite: Service Brake Assist light returns after replacement; Check Engine light returns after replacement; ABS light returns after replacement; Brake warning lights reappear immediately after test drive by dealer
Codes mentioned: Service Brake Assist, Check Engine, ABS warning, EBCM failure
Repairs/costs cited: Dealership replaced EBCM and master cylinder assembly; replacement failed after 7 miles. Second replacement attempted; failed after 10 miles. Third replacement ordered but vehicle remained in shop. No root cause identified by manufacturer.
Recalls/TSBs owners mention: Dealership reaching out to GM to determine resolution; vehicle in shop for 3+ weeks at time of complaint.
Brake Warning Lights and Disabled Safety Systems
Dashboard warning lights (brake assist, ESC, ABS, traction control, collision warning) illuminate indicating brake system and electronic stability control malfunction. Associated safety systems (ABS, ESC, AEB, lane keep assist, adaptive cruise, standard cruise control) become non-functional even after dealer clears codes.
When: Occurs typically under 10,000 miles (recorded at 69 miles, 1,150 miles, 4,500 miles, 6,000 miles). Codes persist even after clearing.
Symptoms owners cite: Service Brake Assist warning light; Service ESC warning light; ABS warning light (yellow or red); Electronic Stability Control warning; Traction control warning; Collision warning indicator; Brake light indicator (red); Cruise control non-functional; ABS, ESC, AEB, lane keep assist, adaptive cruise disabled
Codes mentioned: Service Brake Assist, Service ESC, ABS, Traction Control, Electronic Stability Control, Collision Warning, Brake system
Repairs/costs cited: Dealer diagnosis identifies master brake cylinder and/or Electronic Brake Control Module (EBCM) as faulty. Parts often on nationwide backorder with ETA unknown or weeks to months away. One owner reports conflicting guidance from dealer (says safe to drive) versus owner's manual (brake light lit, should not drive).
Recalls/TSBs owners mention: Parts on nationwide backorder. No ETA available in most cases. One owner mentions GM created a case for part availability delay.
Intermittent Brake Failures—No Reproducible Pattern
Brake failures occur three separate times with firm brake pedal but no braking response, yet dealership cannot reproduce the issue. Dealer states if they cannot reproduce failure, vehicle will be returned to owner unfixed.
When: Three separate occurrences reported; no clear mileage pattern provided.
Symptoms owners cite: Brake pedal becomes firm; Vehicle will not stop or slow; No warning lights on dash prior to failure; Failures unpredictable and difficult to diagnose
Repairs/costs cited: Dealership received loaner vehicle but refuses to proceed with repair if failure cannot be reproduced.
Synthesized from 30 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 10 most recent
While driving vehicle, multiple warning codes appeared including: service traction control, ABS, service brake system and others. More importantly, the power brakes failed and a code was thrown to press hard on brakes to stop vehicle.
We had complete brake system failure while driving the car on the highway. The brakes went all the way to the floor when applied and we came inches going into fast moving oncoming traffic before the vehicle stopped. I had to push the break with both feet with all the strength I had to get the brakes to respond at all. The brake assist failure warning light came on and another warning light came…
While driving my 2025 GMC Acadia Denali on [XXX], from Omaha, NE, to Laurie, MO, I received a "Service Brake Assist" warning lamp as well as "Check Engine" and "ABS" warning lamps in St. Joseph, MO. At this point, my vehicle had 6,945 miles on it. We turned around and went back to Omaha. We dropped the car with Gregg Young Chevrolet at 7,095 miles. The dealership identified the issue as EBCM and…
I purchased the car on [XXX]. Drove the car about 8000 miles and then all of a sudden the dash lights all lit up for the brakes, ABS, traction control. I pulled the car over and turned it off. When I restarted my car, the lights continued to stay on and it told me to service immediately. I called my dealer and they could not get me in within 2 weeks so I took it to another local GMC dealer who…
Brake assist warning message and BRAKE light appeared a couple of weeks ago, along with others. Brought the car into the dealer, who initially thought they cleared the errors and reported no additional issues when they ran the diagnostics. Nothing was cleared. Vehicle application and monitor also does not show an issue, even though the warning appears at each start up and none of the related…
Purchase vehicle on August 13, 2025 with 27 miles on it. Drove home from dealership. Started the car on Friday morning and all of these warning lights appeared - Electronic Stability Control, Brake Assist Service, Brake light indicator, ABS indicator, traction control indicator, collision warning indicator. Car only had 69 miles at the time. Took vehicle to dealership on August 18, 2025.…
I purchased the vehicle, and twelve days later while operating the vehicle I experienced full braking power failure. My foot was to the floor board while trying to get the car to slow down. Up until the point of brake failure, there were no warning lights or "symptoms" that would alert me as to an impending problem. My young child was also in the car so that was extremely scary also. During this…
dash lit up with ABS, traction control, and ESC warnings. Technician stated the entire brake system needed to be rebuilt. There is currently no ETA on when the parts to be able to accomplish this will be available.
Approximately July 12 2025 while driving to dinner two warnings showed on the Driver Information Cluster (1) Check Brake Assist (2) Check ESC. Took vehicle to dealer the next business day for diagnosis. Service department stated the problem was the EBCM or Electronic Brake Control Module and the parts are on a Nationwide backorder. Since the part failure all brake system associated lights on the…
Had brakes trouble with your 2025 GMC Acadia?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the brakes problem on the 2025 GMC Acadia?
It's a documented issue but not catastrophic. 30 complaints have been filed. Repairs average $450 and most owners catch it before it causes a breakdown.
At what mileage does the brakes typically fail?
Mileage data is limited for this issue. Owners report failures across a wide range, suggesting cause is more about driving conditions and maintenance than mileage alone.
What does it cost to fix?
Independent shops typically charge around $450 for brakes repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to brakes?
No active recalls currently cover brakes issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2025/GMC/Acadia.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.