Loss of braking on the 2015 Nissan Leaf
2 crashes 1 injury 3 of the 22 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 loss of braking gets reported
Owners of the 2015 Nissan Leaf report loss of braking at a median of 10,000 miles. A quarter of the reports come in before 2,100 miles and a quarter after 50,000 miles, from 15 reports that carried an odometer reading.
A part like this is normally expected to survive 78,000 miles. It is the 2nd most-reported problem on this model year.
The mileage distribution
The reported range runs from 700 miles at the tenth percentile to 55,000 miles at the ninetieth, a spread of 53,492 miles across the middle 80% of reports.
Reports bunched into a band this tight usually mean the component has a life of its own: it goes at roughly the same mileage regardless of who owns it.
60% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 700 miles | 2,100 miles | 11,000 miles | 51,000 miles | 54,192 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, 2 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 $400–$3,000 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 5 model years of this car. It shows up earliest on the 2017, at a median of 5,000 miles, and latest on the 2013 at 45,000 miles.
By volume the 2015 is the worst of them, which makes this a problem of this specific year rather than of the model as a whole.
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.
My 2015 leaf s is 3 weeks old with less than 700 miles. I was descending an 8% grade hill in b mode with a sharp bend at the bottom. As I went to apply the brakes, the pedal went to the floor and b mode cut out. The car was now rolling down the hill and accelerating under gravity with no brakes and without b mode slowing the car. I was expecting to hit a brick wall at the bottom of the hill when suddenly, after no more than two seconds, the brakes and b mode came back on and I safely stopped. On reflection after the incident, it was as if the whole computer/electronics momentarily shut down and then rebooted. I didn't notice if the dash lights went off or not. *tr
My 2015 leaf s is 3 weeks old with less than 700 miles. I was descending an 8% grade hill in b mode with a sharp bend at the bottom. As I went to apply the brakes, the pedal went to the floor and b mode cut out. The car was now rolling down the hill and accelerating under gravity with no brakes and without b mode slowing the car. I was expecting to hit a brick wall at the bottom of the hill when suddenly, after no more than two seconds, the brakes and b mode came back on and I safely stopped. On reflection after the incident, it was as if the whole computer/electronics momentarily shut down and then rebooted. I didn't notice if the dash lights went off or not. *tr
My 2015 leaf s is 3 weeks old with less than 700 miles. I was descending an 8% grade hill in b mode with a sharp bend at the bottom. As I went to apply the brakes, the pedal went to the floor and b mode cut out. The car was now rolling down the hill and accelerating under gravity with no brakes and without b mode slowing the car. I was expecting to hit a brick wall at the bottom of the hill when suddenly, after no more than two seconds, the brakes and b mode came back on and I safely stopped. On reflection after the incident, it was as if the whole computer/electronics momentarily shut down and then rebooted. I didn't notice if the dash lights went off or not. *tr
Also reported on the 2015 Nissan Leaf
Other brake problem
Parking brake failure
ABS module or sensor failure
Other electrical problem
Other speed control problem
Other engine problem
How far this goes
Complaints are voluntary, so 22 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 loss of braking happen on the 2015 Nissan Leaf?
Across 15 owner reports that included an odometer reading, half were filed by 10,000 miles. A quarter were filed before 2,100 miles and a quarter after 50,000 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is loss of braking on the 2015 Nissan Leaf?
22 reports have been filed with NHTSA, about 0.4 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