Master cylinder or brake booster failure on the 2012 Ford Edge
3 crashes 1 injury 4 of the 114 reports for this failure mention a crash, a fire, an injury or a death. Those are the owner's words on the complaint form, not a verified finding, and one report can mention more than one.
When master cylinder or brake booster failure gets reported
Owners of the 2012 Ford Edge report master cylinder or brake booster failure at a median of 72,500 miles. A quarter of the reports come in before 42,500 miles and a quarter after 100,000 miles, from 87 reports that carried an odometer reading.
A part like this is normally expected to survive 92,000 miles. It is the 4th most-reported problem on this model year.
The mileage distribution
The reported range runs from 27,500 miles at the tenth percentile to 125,000 miles at the ninetieth, a spread of 97,443 miles across the middle 80% of reports.
A spread this wide points at use rather than design. Towing, climate, service history and city mileage all move a failure like this, so the median is a weak guide to any individual car.
20% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 26,757 miles | 42,000 miles | 73,030 miles | 100,000 miles | 124,200 miles |
Read the 10th percentile as “one report in ten arrived this early”. Exact figures are shown in this table because it is the table of record; everywhere else on the site they are rounded to the precision the sample can carry.
What a percentile can and cannot tell you here
These five numbers describe the readings owners gave, in order. The median is the middle one: half the reports arrived below it. The 10th and 90th are the edges of the bulk of the distribution, and the distance between them is the part worth reading. A tight spread — say 70,000 to 95,000 miles — points at something that wears out on a schedule, and the schedule is knowable. A wide one, 20,000 to 190,000, points at a fault that hits some cars and never troubles others, which means the mileage on the listing in front of you tells you very little about your odds.
What these figures are not is a survival curve. Every reading here comes from a car whose owner filed a complaint, so the sample contains only failures: it cannot say what share of the fleet made it past 150,000 miles untouched, because those owners had nothing to report. Nor is the mileage the moment of failure — it is the odometer reading as recalled at the time of filing, which may be weeks later and is sometimes rounded to the nearest ten thousand by the person typing it.
Percentiles are shown at all only once 8 readings exist for the vehicle and mode. Below that the middle of a handful of numbers is noise wearing a decimal point, so the figures are withheld rather than dressed up.
What happens, and what it costs
Of these reports, 3 a crash and 1 an injury are mentioned. Owners write their own complaints and the agency does not verify them, so read this as what the reports say happened rather than as a confirmed count.
Putting it right typically runs $450–$2,200 at an independent US shop. That range is an editorial estimate held in this site's failure-mode catalogue, not a figure from NHTSA, and it is a repair cost rather than a diagnosis cost.
This mode is classified as critical, which means a failure can leave the car unable to stop, steer, or stay out of the way of traffic. It is weighted accordingly in the risk score.
The same failure on other years
The same failure is reported on 11 model years of this car. It shows up earliest on the 2016, at a median of 60,000 miles, and latest on the 2015 at 140,000 miles.
By volume the 2013 carries the most reports, with 305; the 2012 has 114. A mode that appears across most years of a model is usually a design choice rather than a bad batch.
If one year stands out to the left, that is the year to avoid; if the whole line sits at a similar mileage, this is wear rather than a defect in one production run.
Tick median reported mileage Solid middle half of reports Faint 10th to 90th percentile Colour how bad the failure is when it happens
What owners wrote
Verbatim from NHTSA complaint narratives, trimmed for length. The mileage is the one the owner gave.
I was driving down a steep hill (parking lot from work) this leads onto a busy avenue. When I pressed on the brakes I noticed my vehicle rolled onto the street,I could not stop. I quickly turned right. Thank god there were no cars coming. However, had I not quickly turn, the car would have rolled right onto the center of the street and I would have gotten side swapped both ways. I could not pull over so I drove slow going under 10 MPH and turned on to a road and pulled into a pharmacy parking lot in which I let the car roll into a parking space and I called the towing company and had it towed to the dealer I purchased it from. I was told yesterday that the brake booster failed. After asking what it was, I then asked why and how did it fail. They stated it was defected and things like this happen and that is why new cars have warranty's. They were waiting to receive the part so they can replace it. I'm not confident that my car is safe and I told them I had a 5 year old daughter and was concerned about the safety of the car. The dealer said they can't guarantee nothing else will happen, but that is why new cars are under warranty…
Brakes began to have a hard pedal when starting the vehicle a few weeks ago. Had hard brake pedal that was not consistent at first, happened twice in two weeks but was less noticeable. Vehicle became unsafe to drive today as the pedal would become difficult to push after first application of pedal (such as in stop and go traffic, etc.). The vehicle requires pushing the pedal with both feet to stop it even from low speed. The brakes are about 10% stopping power. I have never experienced anything so dangerous in a new vehicle. *tr
On various dates, moving at various speeds (from pulling into or out of a parking spot to getting off the freeway) I began to notice that when applying the brakes, the edge would not slow down as it should. At times, I became afraid that the vehicle would rear-end another vehicle or I would hit someone in a cross walk. I had to press very hard on the brakes and even then, it was difficult to stop the vehicle. At first, I thought I was just being paranoid, but when this occurred 3 times in one day on 9/17/13, we brought the car into the local ford dealership to have them inspect it right away. Later that night, a ford mechanic called and explained that the "brake booster" was defective and pressure was not being applied adequately to stop the car. We bought this vehicle new in april 2012. I see no reason why this part should have gone bad in just 1 year.
Also reported on the 2012 Ford Edge
Other electrical problem
Other body or interior problem
Door latch or handle failure
Other brake problem
Other lighting problem
Other engine problem
How far this goes
Complaints are voluntary, so 114 is a floor and not a count of affected cars. Mileages are typed in by owners and cluster on round numbers. And the mode itself is assigned by software reading the complaint text, which is reliable in bulk and fallible one report at a time.
Questions this page answers
At what mileage does master cylinder or brake booster failure happen on the 2012 Ford Edge?
Across 87 owner reports that included an odometer reading, half were filed by 72,500 miles. A quarter were filed before 42,500 miles and a quarter after 100,000 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is master cylinder or brake booster failure on the 2012 Ford Edge?
114 reports have been filed with NHTSA, about 8.2 per 1,000 vehicles. Complaints are voluntary, so this is a floor rather than a count of affected cars.
What this is and is not. These are the mileages at which owners chose to complain to a federal agency, which is not the same as the mileage at which the part fails on every car. It skews toward failures that happened outside warranty, cost real money, or frightened someone. It is still the only public dataset that carries failure mileage at all, and the shape of a few hundred readings is informative even when a single one is not. Methodology · JSON · this failure on other cars
Source Owner complaints and recall records published by the US National Highway Traffic Safety Administration, model years 1996–2027 Figures rebuilt Published by AtWhatMileage How every figure is computed