Brake complaints by model year
Which parts fail
Components named in complaints (service brakes, ABS, rotors and pads, parking brake).
Mileage when the problem started
What owners report
Driving downhill after dropping my children off at school heard a loud popping noise and brake pedal fell to the floor. Total loss of brakes. Coasted to the side off the road narrowly avoiding busy intersection. Vehicle was looked at by mechanic, traced to faulty ABS Sensor. Serious safety hazard- Recall must be issued immediately to prevent accidents and injuries!
Brake pedal went to floor on my 10 Mariner, slid into intersection, no warning lights came on, checked for any fluid leaks and there were none. This is 2nd time it has happened and is extremely dangerous! Believe, like others that it is the ABS control. Ford should fix this immediately!
The contact owns a 2009 Mercury Mariner. The contact stated that while attempting to apply the brake, an excessive amount of pressure was needed to depress the brake pedal before the vehicle stopped. The contact stated that the brake pedal went to the floor. The contact had taken the vehicle to a certified mechanic who was unable to identify the cause of the failure. The vehicle had not been repaired. The contact stated that the failure was related to NHTSA Campaign Number: 19V904000 (Service Brakes, Hydraulic). The manufacturer was made aware of the failure and confirmed that the VIN was not included. The approximate failure mileage was 86,000.
Couple weeks back, significant other encountered issue with brake signal coming on and needed to pretty much press the brakes to the floor to get it to brake. Took it to a nearby shop and they weren't familiar with the car, so they recommended to bleed the brakes according to error code and online. Signal went away for a bit. Signal came back with no immediate brake issue. Took to the dealership and they replaced some parts which also made the signal disappear for now. The parts were: Booster brake (a booster asy - brake), a bush, a module. Assuming the part replacement effectively hid the issue like a brake bleed. Few days later while driving about 40mph later the brake signal came on, wasn't touching the brakes at the time. Went to brake and they weren't reacting normally and wasn't braking. Had to also pretty much press hard on the pedal and get the pedal to the floor to break. …
The contact owns a 2008 Mercury Mariner. The contact stated that while driving at 30 MPH, he had to hard brake, however, afterward while depressing the brake pedal, the brake pedal traveled to the floorboard. The vehicle was taken to the dealer where the failure was diagnosed as a hydraulic control unit (HCU) failure. The contact was informed that the HCU needed to be replaced. The contact stated that the vehicle was not repaired as the parts were on backorder. The contact stated that he discovered NHTSA Campaign Number: 19V904000 (Service Brakes, Hydraulic) however, the VIN nor the Year/Make/Model was not included in the recall. The manufacturer was notified of the failure and informed that contact to call the NHTSA Hotline to file a complaint. The approximate failure mileage was 89,000.
Brakes go to floor dealer said they see nothing. They gave my vehicle back brake are normal again.two months go by it happens again but it fixed itself after 2 days. This just happen again 8/5/2022. I see a recall NHTSA campaign #19V904000 ,MFG campaign #19S54 Also a NHTSA recall#150546 How am I going to drive with brakes on the floor My vehicle is a 2008 Mercury Mariner Thanks in advance
Recall for coolant pump on hybrid system could result in hybrid electronic overheating causing a stall like condition recall was addressed by dealership back on 7/20/2015 2nd owner has had vehicle for 9 mnths - have had 3 incidents of vehicle shutting down with dash light advising to pull over for safety and the system shutting down directly after - brakes /steering etc. For the first incident - towed to local dealership - unable to diagnose 2nd incident - to a reputable local mechanics shop - changed out normal vehicle battery 3rd incident - caused driver to roll through an intersection on a red light - struck by other vehicle
Tl* the contact owns a 2006 Mercury Mariner. The contact stated that the brakes failed without warning. The contact was able to merge to the side of the road without incident. After inspecting the vehicle, the contact noticed that the two front driver side brakes lines connected to the caliber fractured. The manufacturer was made aware of the failure. The vehicle was repaired. The failure mileage was 80,000.
Frequently asked questions
Which Mercury Mariner years have brake problems?
By NHTSA complaints, the 2008 (35), 2009 (14), 2006 (8) and 2010 (5) model years. Brake complaints make up 8% of all complaints for the 2008.
Is there a recall for Mercury Mariner brake problems?
No. NHTSA lists no brakes recall for any Mercury Mariner model year. A widespread problem may still be covered by an extended warranty or a manufacturer service bulletin, so ask a dealer.
At what mileage do Mercury Mariner brake problems start?
Across all years, half of the complaints with a recorded mileage happened before about 98,000 miles; 13% happened before 50,000 miles.
What part fails most often?
Owners most often name the foundation components › master cylinder (1 mentions), followed by the antilock/traction control/electronic limited slip (1).
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.