2009 Mercury Mariner Brakes Problems
- Complaints
- 14about this part
- Share
- 4%of 315 total for the year
- Median mileage
- 98,291miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 14 complaints about the brakes of the 2009 Mercury Mariner, 4% of the 315 complaints for this model year. Where a mileage was given, the median is 98,291 miles. 2 of these say a crash was involved, according to the filers.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“After ABS activated brake padel became soft. My vehicle has a simlar problem expained under ''safety recall 19s54 ' anti-lock brake system hydraulic control unit valve function''. Eventhough ford recalled several unites, my VIN did not list under the recalled units.”
NHTSA complaint #11349677, filed 2020-08, 150,000 miles“While I was driving on hwy doing 75mph my Mercury Mariner 2009 it suddenly loss power and (while engine was running) I could not accelerate. Tool light came on. I could not do anything to regain speed (accelerator was disable) and the only fix was to shut down the engine and re-start. Vehicle will start and work normally I took to the mechanics the next day he said that no codes came up.”
NHTSA complaint #10586997, filed 2014-05, 62,854 miles“Our son is driving this car wit 90k miles on it. Had 1200 of break work done after feeling like the pedal was going down too far and he could not stop well and then it ended up needing a new ehcu to the tune of 2600$. This is a very critical component and from what I read, there are a lot of people experiencing this problem. It should not fail and ford as not issued a recall. I called ford to see if there could be any assistance and they said no. Good cars are being junked for this reason and it is a severe safety issue.”
NHTSA complaint #11367005, filed 2020-10, 90,000 miles“Have had multiple brake failures including an accident that my daughter was involved in as a result of brake failure. The brakes will work fine for a short period of time and then out of nowhere you step on the brake and there's just a soft pedal for about 3/4 of the was before you get a very soft brake. Into this for thousands and now ford says a hydraulic brake sensor is the problem for between $2100-2400. Heard that it was fixed every time I've picked it up. Dangerous!!! My daughter or someone else could have been killed.”
NHTSA complaint #11013914, filed 2017-08, 100,000 miles“Coming to red light one car in front of me. I pushed down on brake petal and it was hard to push down. Engine revved up to over 5 RPM's and car wouldn't stop finally I put car in neutral and engine went back to idle position. Almost rear ended car in front of me. Took Mariner to dealer who wasn't very helpful because he never heard of this before & wanted to know if I wanted to leave Mariner there. Also ask if I had my foot on the gas petal instead of the brake. Dealer was unable to verify concern so they replaced canister purge valve. …”
NHTSA complaint #10401772, filed 2011-05, 16,530 milesRelated service bulletins
- 10091151Oct 17, 2016Some 2008-2017 ford/mercury/lincoln vehicles equipped with sync may generate a vhr that identifies a concern with the brakes and suspension category indicating service is…
- 10090681Oct 17, 2016Some 2008-2017 ford/mercury/lincoln vehicles equipped with sync may generate a vhr that identifies a concern with the brakes and suspension category indicating service is…
- 10032626Apr 1, 2010Ford/mercury: abs module self test creating a slight vibration in accelerator/brake pedal at 12mph (20km/h) and/or 42mph (68km/h). The abs module will initiate a one time self…
- 10030845Dec 1, 2009Ford/mercury: abs module self test creating a slight vibration in accel/brake pedal at 12mph (20km/h) and/or 42mph (68km/h). The abs module will initiate a one time self test at…
Brakes: other model years
Other parts of the 2009 Mercury Mariner
167 complaintsEngine
53 complaintsTransmission and drivetrain
44 complaintsVehicle speed control
41 complaintsFuel system
30 complaintsElectrical system
22 complaintsOther or unknown
15 complaintsEngine cooling
7 complaintsWheels
7 complaintsAir bags
4 complaintsElectronic stability control
4 complaintsBody and structure
3 complaints
← All problems reported for the 2009 Mercury Mariner
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology