This informational bulletin instructs the tech when fuel/fluid is needed to be tested and where it can be sent for analysis.
full bulletin at NHTSA ↗2019 GMC Terrain brakes problems
severe Owners of the 2019 GMC Terrain have filed 42 NHTSA complaints about the brakes, typically surfacing around 76,000 miles at roughly $450 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See brakes across all vehicles →
Failure mileage
Complaints
42
Recalls
0
Avg fix
$450
| Model year | brakes complaints |
|---|---|
| 2015 Terrain | 5 |
| 2016 Terrain | 4 |
| 2018 Terrain | 65 |
| 2019 Terrain (this page) | 42 |
| 2020 Terrain | 54 |
| 2021 Terrain | 6 |
1crash
3injuries
When does it fail?
Of the 42 brakes complaints filed for the 2019 GMC Terrain, here's the actual mileage breakdown — failures cluster heaviest at 25,000-50,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Owners have filed 42 brakes complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Among the 10 model years of GMC Terrain in our records for brakes problems, this one ranks #3 by owner-complaint volume.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering brakes on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This 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.
full bulletin at NHTSA ↗This preliminary information discusses potential for a code C0010.5A to store in the brake controller which appears to be setting falsely or is induced by the customer.
full bulletin at NHTSA ↗This 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.
full bulletin at NHTSA ↗This service bulletin provides diagnostic/repair information to correct customer concerns of a Crank No Start or Extended Crank, Malfunction Indicator Lamp (MIL) Illuminated or Possible Increased Brake Pedal Effort.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The brake vacuum pump on the 2019 GMC Terrain fails unexpectedly across a wide mileage range (20k–120k miles), with zero pre-failure warning in most cases. When it goes, the brake pedal suddenly becomes rock-hard and nearly impossible to depress, leaving drivers with little to no stopping power at speed. A "Service Brake Assist" light typically appears only after the failure has already started, offering no advance notice. Owners describe terrifying moments on highways, interstate ramps, and city streets where they had to fight the wheel to slow down enough to avoid collisions—some almost struck other vehicles or pedestrians.
The pump itself often fractures or shatters internally, sending metal shavings and debris into the engine. This secondary damage to the camshaft, timing chain, valve cover gasket, and other components has forced some owners into full engine replacements costing thousands of dollars. Some owners experienced the same pump failure twice or three times in quick succession, even after replacement with OEM parts.
Repair costs range from $450 to $900 just for the pump replacement, not counting diagnosis ($500) or towing. When engine damage occurs, bills climb to $4,000–$5,000 or more. Owners report that GMC has recalled this same component on Chevy Equinox and other models, but the Terrain remains unrecalled despite repeated complaints and injuries.
Same GMC Terrain brakes reports on nearby years: 2018 · 2020
Failure modes owners describe
Brake vacuum pump/booster failure
The brake vacuum pump or booster suddenly fails, typically mid-drive, causing brake assist to cease. The brake pedal becomes extremely hard to depress and requires excessive force, severely limiting braking power. Owners report zero to minimal warning—typically only a 'Service Brake Assist' warning light appears after failure starts, not before.
When: Varies widely: 20k–120k miles reported. Owners describe sudden onset with no prior symptoms. Some report failures within weeks of first replacement.
Symptoms owners cite: Brake pedal suddenly becomes stiff and extremely hard to depress; Severe reduction in braking power despite hard pedal pressure; Vehicle unable to slow or stop at normal speeds; 'Service Brake Assist' warning light (appears during or after failure, not before); 'Reduced Engine Power' message (in some cases); Check engine light may illuminate; No audible warning or vibration prior to failure
Codes mentioned: Service Brake Assist warning, Reduced Engine Power (secondary symptom when vacuum pump debris enters engine)
Repairs/costs cited: Replacement of vacuum pump/booster: $450–$900 reported. Some cases required additional repairs (camshaft, timing chain, valve cover gasket, water pump, engine replacement) due to internal damage from pump failure or metal debris entering engine.
Recalls/TSBs owners mention: GMC has issued recalls on vacuum pumps for other models (Chevy Equinox, and other GMC/Chevy/Cadillac/Buick models per owner reports) but has not recalled the 2019 Terrain despite repeated complaints. Owners mention warranty typically covers only brake caliper, pads, and rotors—not the pump itself.
Brake vacuum pump destruction and engine damage
The vacuum pump fractures, shatters, or explodes internally, sending metal shavings and debris into the engine and supporting components (camshaft, timing chain, valve cover gasket, water pump). This secondary damage can render the engine unusable or require full engine replacement.
When: Typically discovered after initial brake failure. Metal debris and shavings noted in oil or discovered during disassembly. Engine damage reports range from 40k to 120k miles.
Symptoms owners cite: Metal shavings in engine oil; Disintegrated bearings in pump; Damaged or stripped camshaft and gears; Damaged timing chain; Stripped valve cover gasket; Engine hesitation and difficulty starting after pump replacement; Vehicle unable to start or run after initial repair
Codes mentioned: Service Brake Assist warning, Check engine light
Repairs/costs cited: Full engine replacement: cost mentioned as $4,000–$5,000+. Partial repairs (camshaft, timing chain, valve cover gasket, water pump, oil change) also reported. Some repairs required in-engine cleaning.
Recalls/TSBs owners mention: No manufacturer recalls issued for the 2019 Terrain. Owners report GMC has recalled the same component on other model years and brands (Chevy Equinox, Cadillac, Buick).
Brake caliper fracture and brake system hardware failure
Brake caliper cracks or fractures, leading to brake fluid loss and complete brake system failure. Associated with failed brake sensor and actuator.
When: Approximately 40k miles reported in one case.
Symptoms owners cite: Brake pedal depressed but vehicle fails to stop; Brake pedal sinks to floorboard; Puddle of brake fluid visible under vehicle; 'Low Brake Fluid' message displayed; Unknown warning lights illuminated
Codes mentioned: Low Brake Fluid warning
Repairs/costs cited: Brake caliper replacement, brake pads, and rotors. Brake sensor and actuator also failed in the reported case. Manufacturer warranty would only cover caliper, pads, and rotors per dealer communication.
Recalls/TSBs owners mention: Manufacturer contacted; covered only caliper, pads, and rotors. Sensor and actuator failure not covered under manufacturer warranty according to owner report.
Repeated brake vacuum pump failure
Brake vacuum pump fails, is replaced with OEM part, but fails again shortly afterward—sometimes within weeks or months. Owner had three separate failures.
When: First failure, then second failure after 2 weeks, third failure after approximately 1 year.
Symptoms owners cite: Hard brake pedal during braking; Severely reduced braking power; Vehicle unable to respond as needed to brake input; Second failure on interstate caused additional component damage (camshaft, timing chain)
Codes mentioned: Service Brake Assist warning
Repairs/costs cited: Replacement pump cost not specified in narrative. Second replacement was OEM. Third failure resulted in diagnosis of engine damage requiring full engine replacement.
Recalls/TSBs owners mention: No recall issued. Repeated failures with OEM replacements suggest systemic defect.
Initial brake system failure without pump diagnosis
Brake failure occurs, but initial diagnosis and repair attempts do not correctly identify the vacuum pump. Vehicle was serviced for bad battery, computer, and fuel pump before underlying vacuum pump issue was recognized.
When: Failure at less than 30k miles (October 2021). Diagnosis took from Nov 2 to Nov 20+ with no clear resolution reported.
Symptoms owners cite: Sudden loss of brakes while driving; Vehicle stalled; Vehicle would not start after incident; Could not place in neutral
Repairs/costs cited: Dealer replaced battery, computer module, and fuel pump (allegedly due to 'bad gas'). By Nov 20, 2021, no clear diagnosis of the root cause had been provided to owner after 18+ days.
Recalls/TSBs owners mention: Dealer awaiting specialist from out of town; no clear resolution provided in narrative.
Synthesized from 42 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 3 most recent
Failure of the cam driven vacuum pump causing brake failure. Leading to a hard brake pedal which increases risk of a crash. Debris from the broken vacuum pump can fall down into the engine causing a catastrophic failure of the engine needing a replacement. This happens with little to no warning. Warranty companies will not pay to repair the known issue. A recall needs to be issued for this to…
For the third time, the brake booster has failed on our GMC Terrain. We had the first replaced with an OEM part. That booster failed after 2 weeks. A second OEM brake booster was installed. That one lasted about a year until it failed as well. This time we were traveling down the interstate and interstate speeds. There were no indications of an issue until trying to slow down when attempting to…
The contact's client leased a 2019 GMC Terrain from Hertz Leasing Company. The contact stated while her client was driving approximately 60 MPH, the brake pedal was depressed but failed to go down and did not respond. The brake assist warning light was illuminated. The contact stated that her client continued driving and allowed the vehicle to decelerate independently. The contact's client then…
Had brakes trouble with your 2019 GMC Terrain?
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 2019 GMC Terrain?
It's a meaningful issue. 42 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $450.
At what mileage does the brakes typically fail?
Across the 8 complaints that reported odometer mileage, most brakes failures cluster between 42,000 and 84,400 miles, with the median around 76,000. A quarter of owners report trouble before 42,000; a quarter make it past 84,400. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
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/2019/GMC/Terrain.
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.