On two separate occasions when parking, and driving at a high rate of soeedv( 60 MPH)on interstate in sudden stop and go traffic brakes failed to engage after working properly before and again after with more than a month between incidents . The second incident occurred on 12/31/18 after the vehicle had been in for routine oil change and service that included a multi point inspection at the GMC…
2015 GMC Yukon brakes problems
severe 57 complaints filed with NHTSA · avg repair $450 · see brakes across all vehicles →
Failure mileage
Complaints
57
Recalls
0
Avg fix
$450
2crashes
2injuries
When does it fail?
Of the 57 brakes complaints filed for the 2015 GMC Yukon, 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
Of the 14 model years of GMC Yukon we track for brakes problems, this one carries the most owner complaints on file — 57.
Owners have filed 57 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.
The failure pattern owners describe
Buyer takeaway: Brake failures at low speeds and highway speeds are widely reported on 2015 GMC Yukons, with some owners involved in crashes and injuries. A recall was issued but has not resolved the problem for many owners, and out-of-pocket costs for vacuum-pump replacement can exceed $600—even after recall work. Avoid this model unless you're prepared for expensive, recurring brake repairs and the safety risk they pose.
Owners consistently describe brake-pedal stiffness and loss of braking power at low speeds—below 5 mph in parking lots, drive-throughs, and stop-and-go traffic. The pedal becomes rock hard and unresponsive, requiring excessive foot force to stop the vehicle. Some report the pedal goes to the floor with no pressure. Failures occur without warning; brakes may work normally one moment and fail the next. Owners describe needing to pump the brake pedal repeatedly to achieve stopping, or using the emergency brake as a workaround.
Several owners report complete brake failure at highway speed (60–70 mph), with one incident involving loss of control and a near-fatal crash. At least one owner confirms vacuum-pump failure as the diagnosed cause; others report dealers identifying faulty vacuum pumps, brake boosters, and damaged braking systems.
Brake-light failures are separate but reported: LED tail lights dim intermittently or fail completely due to cracked circuit boards. Owners cite repair costs of $500–$1,000 per light assembly.
Trailer-brake-system warnings are continuously triggered with no towed load present, causing persistent dinging and on-screen alerts that distract drivers.
A recall (NHTSA 19V645000 for hydraulic service brakes) was performed on some vehicles, but failures persisted post-repair. Some owners report the vacuum pump is not covered under that recall and dealers demand out-of-pocket replacement costs ($400–$600).
Same GMC Yukon brakes reports on nearby years: 2016 · 2017
Failure modes owners describe
Low-speed brake failure—pedal stiffness and power loss
At speeds under 5 mph (parking, drive-throughs, stop-and-go traffic), brake pedal becomes extremely stiff and unresponsive. Vehicle does not stop or stops only after excessive foot force or multiple pump cycles. Pedal may feel rock-hard like a brick underneath it, or go to the floor with zero hydraulic pressure. Failures are intermittent and unpredictable—brakes work fine then suddenly fail with no warning lights.
When: Low-speed driving: parking lots, drive-throughs, stop-and-go traffic, starting around 80,000 miles; ongoing across model year
Symptoms owners cite: Brake pedal becomes extremely stiff and hard to depress; Pedal unresponsive or goes to floor with no stopping power; Vehicle rolls to a stop instead of stopping when brakes applied; Requires standing on pedal or multiple pump cycles to achieve stopping; No warning indicator illuminates; Emergency brake required to stop vehicle; Intermittent—occurs randomly without pattern
Repairs/costs cited: Vacuum pump replacement ($400–$600 at dealer); brake booster replacement; master cylinder replacement; entire braking-system replacement reported in one case. Recall 19V645000 performed on some vehicles, but failures persisted. Some dealers refused to cover repair under recall if vacuum pump not specifically addressed.
Recalls/TSBs owners mention: NHTSA Recall 19V645000 (Service Brake, Hydraulic) issued; repair often involved software update. Dealers stated vacuum pump not covered under initial recall, demanded out-of-pocket payment. One case noted vacuum-pump recall has not been issued. Manufacturer stated pedals work as designed when height/spacing issue raised. Some owners report manufacturer referred them to NHTSA rather than providing remedy.
Complete brake failure at highway speed
At freeway speeds (60–70 mph), brake system fails completely. Pedal becomes hard as rock with zero response. Vehicle swerves and owner loses control. One incident resulted in near-fatal crash; another caused collision with tree, injuring occupants.
When: Highway driving at 60–70 mph; incidents reported after prior recall work and during routine driving
Symptoms owners cite: Brake pedal becomes rock-hard, unresponsive; Complete loss of braking power—vehicle will not stop; Vehicle swerves uncontrollably; No warning indicators illuminated; Emergency brake required to stop (or unavoidable collision)
Repairs/costs cited: One owner reported vacuum-pump failure as confirmed cause. Another case noted vacuum pump, vacuum pump belt, brake booster, master cylinder, and vacuum pipe all needed replacement.
Recalls/TSBs owners mention: Manufacturer made aware in at least one injury case. Vacuum-pump recall stated as not issued for some vehicles.
Brake-assist warning light and pedal-feel anomalies
Brake-assist warning light illuminates when brake pedal feels locked up or hard to press. Drivers report pedal vibration and pulsing sensation resembling ABS activation. Hard pedal accompanies illuminated brake-assist or service-brake warning on dash.
When: Various speeds, 10–70 mph; multiple occurrences at 35,000–195,000 miles
Symptoms owners cite: Brake-assist warning light or service-brake warning illuminated; Pedal hard to press requiring extra foot force; Pedal vibrates or pulses as if ABS is activating; Pedal locks up or feels rigid; Vehicle requires firm braking to stop
Repairs/costs cited: Brake booster adjusted or replaced; fluid flushed without resolution. One case noted entire braking system replacement was required after vacuum-pump failure.
Recalls/TSBs owners mention: Manufacturer notified; one case involved NHTSA Campaign 19V645000. Dealers confirmed recalls but repairs did not resolve issues.
Brake-pedal height and gas-pedal gap safety hazard
Brake pedal positioned significantly higher than gas pedal, creating a ~4-inch vertical gap. During emergency braking or quick foot movements, shoe sole gets caught under the elevated brake pedal, preventing full depression and stopping. Owner reported narrowly avoiding five collisions due to foot entrapment.
When: Emergency braking situations and rapid foot repositioning
Symptoms owners cite: Brake pedal mounted substantially higher than gas pedal; Large gap between pedals causes foot to catch under brake pedal; Unable to depress brake fully due to foot/shoe entrapment; Delayed or incomplete braking during emergency stop attempts
Repairs/costs cited: None; manufacturer stated pedals work as designed.
Recalls/TSBs owners mention: GMC responded that pedals are working as designed and nothing can be done. Owner noted similar complaints posted on consumer forums.
Rear brake-light LED failure—circuit-board cracking
Passenger or driver side rear brake lights fail intermittently then completely. LED circuit board inside light assembly cracks, causing electrical short. Lights work sporadically or go out without warning. Repair requires replacement of entire brake-light unit at high cost.
When: 3 years and 66,000 miles to 195,000+ miles
Symptoms owners cite: Rear brake light intermittently fails to illuminate; Complete rear brake-light failure; LED circuit board cracks internally; Electrical short in light assembly
Repairs/costs cited: Entire brake-light unit replacement required; cost $500–$1,000 per side. Alternative: send light assembly off for external repair or purchase aftermarket unit.
Recalls/TSBs owners mention: No recall issued despite numerous owner complaints. One owner noted GMC refuses to recall and treat as individual warranty claim.
Trailer-brake-system false warnings and continuous alerts
Trailer-brake-system warning message displays continuously on dashboard and dings repeatedly, even though vehicle has never towed. Alert persists for duration of drive or occurs dozens of times per trip. No way to silence or dismiss. Distraction hazard while driving.
When: Occurs on multiple drives over months; one owner reported 26 occurrences in single drive
Symptoms owners cite: Trailer-brake-system warning message appears on speedometer/dash repeatedly; Continuous dinging or alert sound; Alert cannot be silenced or dismissed; Occurs despite no trailer attached or towed load; Highly distracting, especially at highway speeds
Repairs/costs cited: One owner reported part cost ~$78 but labor and install ~$400 total. Owners report problem recurs shortly after repair.
Recalls/TSBs owners mention: No official response documented. Dealers aware; warranty coverage varies. One owner noted similar complaints across multiple 2015 GMC Yukon owners.
Synthesized from 57 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 7 most recent
Last week, the power brake assist began fading away intermittently at low speeds, and caught my wife off guard in a grocery store parking lot when she pulled into a parking space and the brakes were not available. She had to plant both feet on the brake pedal in a panic stop before crashing into the car parked in front of her, and has since never driven the vehicle. This is a danger, and is…
Tl* the contact owns a 2015 GMC yukon. While at a drive thru with the brake pedal depressed to the floorboard, the brakes failed. The contact had to apply excessive force in order for the vehicle to stop. There were no warning indicators illuminated. The vehicle was taken to starling Chevrolet Buick GMC (1001 e irlo bronson memorial hwy, st cloud, fl 34769, phone: (407) 892-5144), but the cause…
Power brakes failing at low speeds-in freeway traffic-pulling into driveway requires strong pressing on brake pedal as if the brakes are intermittently loosing power assist
At slow speed in stop and go traffic the brakes will work one time and the next time I would have to stomp the brake pedal to get the SUV to stop it was on a street when it happened I have tried to contact flow GMC of winston-salem multiple times and can't get anyone to talk to me
Earlier this year I purchased a 2015 GMC yukon denali. After driving it a short amount of time I realized the brake pedal is located significantly higher than the gas pedal. I've come to realize that the ~4inch gap is causing a severe safety hazard, especially in emergency braking situations. My foot, along with others in the post linked below, often gets caught in the large gap between the…
Trailer braking system warning is incessantly going off, without cause. Extremely distracting. No way to stop it. Truck has never even towed / trailored anything. Has happened multiple times over the last 6 months. Today occurred 26 times during driving
Had brakes trouble with your 2015 GMC Yukon?
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 2015 GMC Yukon?
It's a meaningful issue. 57 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 38 complaints that reported odometer mileage, most brakes failures cluster between 48,235 and 89,000 miles, with the median around 72,000. A quarter of owners report trouble before 48,235; a quarter make it past 89,000. 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/2015/GMC/Yukon.
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.