Which parts fail
Components named in complaints (service brakes, ABS, rotors and pads, parking brake).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2012 Lincoln MKX owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2012 Lincoln MKX. The contact stated that the brake pedal would depress to the floorboard without warning. The contact took the vehicle to the dealer and the brake master cylinder was replaced; however, the failure persisted. The vehicle was taken back to the dealer where it was then diagnosed with a defective ABS system; however, the part for the repair was on backorder. The manufacturer was also notified of the failure and provided the same information as the dealer. The contact was referred to the NHTSA Hotline for assistance. The vehicle was not repaired. The failure mileage was approximately 130,000.
The contact owns a 2012 Lincoln MKX. The contact stated while driving approximately 35 MPH, the brake pedal became firm and difficult to depress. There were no warning lights illuminated. The vehicle was taken to the local dealer, who diagnosed the failure to be brake booster and brake master cylinder failure. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 67,000. The contact stated the brake booster was replaced.
The contact owns a 2012 Lincoln MKX. The contact stated while driving approximately 45 MPH, there was a brake booster fault and the contact depressed the brake pedal to the floor. There were no warning lights illuminated. The vehicle was taken to a local dealer who diagnosed the failure with the brake booster. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 138,300.
I had to slam on the brakes due to a driver pulling out in front of me without looking. The brakes went to the floor and I had difficulty getting the car stopped. I took it in to my mechanic and they diagnosed as a master cylinder, which I had replaced 7 months prior for a similar incident. But, replacing the master cylinder didn't solve the problem. After more work, they replaced the entire ABS system for the rear brakes ($1900). I drove it 3 times and the brakes locked up on their own while I was driving at 60 miles an hour. When we got to the side of the road, smoke was billowing out of the brakes and the car would not move even though we were pushing the gas. We had the car towed ($300) back to the mechanic. They said the brake fuel line had gotten clogged and the front master cylinder needed to be replaced ($900). …
The braking system failed to adequately stop the car. In contacting the Lincoln Customer Service, this failure mode is associated with a Lincoln Customer program # 13N02. This program has a 10 years or 150000 miles limit for repair. The vehicle (MKX - 2012) has 65000 miles and was purchased 12/20/2011. It is 1 month out of the defined period. The car has only been driven a few hundred miles since 2020 due to illness and death of the owners. The brake system is a safety device and should not be considered a "Customer Care" program with limits as noted above. The failure of a breaking system will cause potential personal injury including death and should be reconsidered as a safety recall or the program should be extended. The incident of a major traffic accident on the highway was avoided that would have involved multiple cars if not taking evasive action in the median. …
What system Failed: Hydraulic Control Unit within the braking system. Brake Pedal and Master cylinder in good working order. Safety Concern: Vehicle failed to stop. Peddle completely to the floor. Accident avoided. Problem Reproduced or confirmed by Service Center: Yes, at a cost of $1,699.00 Inspected: Yes. Vehicle has low miles. Odometer: 114,591 Warnings: No lights or warnings, attempted to stop and brake pedal to the floor. Stopped driving until repairs made. Unsafe! Vehicle failed to stop in normal traffic without warning, speed was approximately 45 mph. Personal Information: Site stated do not list personal information. Therefore, repair invoice available upon request. No upload given at this time.
I was driving and when I pressed on the brake, the pedal went far down and had no indication of the care stopping. It did, but it took a long time to brake. I took it for repair at Firestone, because my dealer warranty was expired. However, the Firestone let me know there is a booster brake replacement letter; the number of the recall is: 13N02. My car still qualifies as it is under 150,000 miles. The dealership repair denies my car is eligible; the main Lincoln office customer service representative also denied my car based on the vin. Is this correct? The letter of Customer Satisfaction Warranty shoes no exception based on vin?
While leaving out my driveway my brakes went straight to the floor before stopping. After I put the car in park and put my foot on the break again it was hard to push the brake pedal. I also hear air coming from the break pedal area. I had no warning and still do not have any warnings. I've noticed after reading a lot of reviews this seem to be a common problem and it's not safe. Mileage 104,000
Driving late at night from dinner, brakes failed. Took MKX to servicing dealer, replaced m/cyl problem still there, order brake controller two weeks ago, part on shortage no due date. Part fit alot of models and years. FMC should pay for parts, very safety failure, we live in rural area and have the car serviced at Ford/Lincoln. no warning lights
Recalled master cylinder brake booster was repaired at the dealership under the recall approx 4 or 5 years ago. The same issue has began again. Out of nowhere while braking, the pedal will become soft and press to the floor. During this time, the car will not slow down. This is resembling a defective part.
Brake complaints in other MKX years
Frequently asked questions
How common are brake problems on the 2012 Lincoln MKX?
NHTSA has 33 complaints about the brakes of the 2012 Lincoln MKX, 39% of the model year's 84 complaints. The component named most often is power assist › vacuum (2 mentions).
Is there a recall for 2012 Lincoln MKX brake problems?
No. NHTSA lists no brakes recall for the 2012 Lincoln MKX, though it has 1 recall for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2012 Lincoln MKX brake problems start?
Half of the complaints with a recorded mileage happened before about 70,000 miles, and 8% before 25,000 miles.
Is it dangerous?
Owners linked 0 crashes, 0 fires and 1 injury to brakes problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.