2021 Ford F-150 Hybrid: brake failure

Filed Oct 17, 2026 · Brakes · OK

I was driving home after dark from a work trip. I was about 15 minutes from home when I slammed on my brakes to avoid hitting a deer that ran out in front of me. I was going approximately 45 miles an hour. Then all of the brake warning lights and ABS Fault lights came on. I was able to get home with no problem and though it might have just been because of the sudden brake application and it would clear at the next drive. When I went to drive my truck next, I had no brakes and the pedal went to the floor. I started looking and found a puddle of brake fluid under my truck. I used to be a mechanic, so I started to trouble shoot the problem and found that a wire mesh covered flexible section of the brake line feeding the front passenger wheel brake caliper had a blow out and is what had failed. Although my 2021 F-150 is out of warranty, a 5 year old well maintained truck shouldn't have a brake line fail and I think I was luck to get home safe. I had my truck towed to the local Ford dealership for the repair. They did a thorough examination and could find a reason for the failure and agreed that it shouldn't have failed and that they had never seen anything like it before.

Filed Nov 27, 2023 · CO

Radio started blasting a boom/ static sound from the rear speakers and subwoofer; extremely loud and has occurred multiple times. It had previously made a similiar sound occasionally at start up which when under warranty was always diagnosed as unable to duplicate but is now occuring while driving and I am out of warranty. Very startling and distracting when it occurs. Has occured multiple times and lasts upto an hour before I gave up an parked my vehicle. Have a special needs minimally verbal disabled child who is very sensitive to noise (rear speakers are always turned off via fade to front) who was very impacted by this loud explosion of chaos/ noise when it occured with him in the car. Ford response: since out of warranty can pay for diagnostic and repairs. Don't expect the federal safety agency to care as they weren't concerned with my complaint regarding complete loss of brakes (incomplete or bad programming) with this truck but maybe this will let others know they arent alone if they have this issue.

Filed Nov 27, 2023 · Acceleration · CO

When making 90° turns such as an immediate right turn or a left turn across one lane, gas pedal becomes completly unresponsive halfway through the turn for approx 3 seconds. Occurs about 1% of the time but drastic when it occurs. Almost multiple accidents have occured with oncoming traffic almost t-boning me when making left turns or being rear ended on right turns: people don't anticipate a vehicle stalling and slowing down when entering traffic and people have swerved into other lanes or the shoulder to avoid a collision. When this occurs, it is like the vehicle goes brain dead, the gas pedal can be pushed to any threshold including floored with no change to speed; rpms dont even increase. Vehicle has been through Ford troubleshooting multiple times and at one point early on, had a Ford engineering/ specialist working remotely with the dealership. Findings from this specialist: two upcoming ota updates will be released that will resolve this concern. One of the updates was in regards to the trailer brake module and the other something else as equally ridiculous as not pertaining to my issue. OTA updates came and issue never went away. Years later, multiple appointments with techs saying unable to duplicate. Dealer now saying they have no record of working with a specialist even though I have the service records from them stating this and electronic communications from Ford regarding this. The issue is not resolved and still occurring. Vehicle now out of warranty so likely will never be repaired. Not faithful in thinking the federal safety agency will care, they didn't care when this vehicle had complete brake failure at 7k miles which was later found to be due to incomplete or bad programming, but maybe this will help others know they are not alone if experiencing this issue.

Filed Feb 19, 2022 · Electrical · MO

The F150 7pin flat The brake pin does not operate properly, fails to get signal from brake pedal. While pulling 6000lb trailer the trailer brakes failed to operate. I currently have a dealer app. On Feb 23 for a safety recall on this truck. They told me they would look at 7 pin at that time.

Filed Feb 5, 2022 · Brakes · OH · crash

Brakes failed to stop vehicle when entering my garage. Vehicles brake pedal went all the way to the floor board while truck continued to roll crashing into garage wall damaging personal items stored in garage as well as drywall, studs, and hair-line vertical cracks in exterior brick veneer. I have security video of the complete incident.

Filed Nov 27, 2021 · Brakes · CO

2021 F150 XLT Powerboost (4x4, 9420 miles). Brakes failed while at a complete stop and truck propelled forward despite brake pedal being being pressed down. I was in a fast food drive through at a complete stop with my foot on the brake pedal and the instrument cluster went crazy, warning lights flashing, malfunction messages for what seemed like everything (believe pre-collision, ABS, traction, hill, and some others- cant recall for sure), warning chimes sounding non stop, the brake pedal dropped towards the floor board, and truck started moving forward despite pressing pedal as far down as I could; this all happened almost instantly. Pumped breaks (not sure if it did anything) but I barley stopped in time from hitting the car in front of me, and I left a far amount of room between us initially. After this, when limping the truck through the drive through (was stuck in the line at this point), it took about 10ft to stop from a 1-2mph roll. After clearing the drive through line, I was limping the truck to open area of parking lot and the truck randomly bucked (like bump starting a manual) and all the instrument cluster warnings disappeared and brake pedal pressure and braking performance returned. Just as how the issue instantly occurred, it also disappeared instantly. Despite all the warnings on the cluster, only ABS Fault and Pre-Collision show on the FordPass app. Prior to to this, there were no issues. The vehicle has yet to be inspected by Ford as the service department is booked out for bit. Vehicle has since been parked as I am fearful a 6k lb vehicle without brakes can end with loss of life. Interesting enough, Ford does not seem to share this concern as their Roadside Assistance Dept says the truck does not have towing coverage while their Customer Care Team says it does but they can't work with each other and end result is I had to prepay $273.06 to Ford Roadside Assistance for the tow to the future service appointment, and maybe Ford might reimburse it.

Filed Aug 30, 2021 · Electrical · ID

The trailer braking system on my new 2021 f150 powerboost malfunctions every once in a while. While towing my 27 ft airstream trailer the brakes will often stop working. They always work when I begin a trip, but then the brakes fail during the trip. I receive a notice when attempting to manually apply trailer brakes from inside the cab that the trailer is not recognized. Several other new f150 powerboost owners are experiencing the same issue and their experiences can be found on the f150gen14.com user forum. I have included a link to the forum thread. Https://www.f150gen14.com/forum/threads/trailer-brake-not-working.3039/ so far none of us have any success working with ford dealers. I have tried several and they are not helpful. I also called ford customer service but they could not find anything in their database indicating there is a problem. The only clue I've found so far, for my truck, has to do with the seven pin plug. We have tried two different testing devices and both show there is about a 6 second delay sending a signal to the ebrake pin. The other pins for lights fire immediately, but the ebrake pin has a delay. Others are looking at the brake module in the truck and other programming issues. As you can see from the user forum there are many theories and no solid solutions yet. I have had my airstream brakes inspected twice and they have not found anything out of the ordinary. This is a serious safety issue because a 7k lb trailer pushing you down a steep mountain with no brakes is terrifying. Someone is going to have a serious accident if ford does not take the issue seriously and find the cause.

Filed Aug 15, 2021 · Electrical · MI

Trailer brakes although operational at start of journey intermittently fail to operate some time thereafter at which point they stay failed. This happens without any warning or notice to the driver. All indications are that trailer is attached correctly e.g. vehicle self diagnosis of trailer lights shows lights operational and trailer connected. Operating the trailer brake via. dash brake controller either shows normal BUT no trailer braking occurs OR will show an error message "No Trailer Attached" but trailer attachment is verified through trailer lights shown (by truck) as operational. Safety implications of this should be obvious - no trailer brakes will force truck to stop truck+trailer combo using only the truck brakes, leading to drastically increased stopping distance or possibility of brake failure e.g. on long downhill stretch of road. Dealer is unable to reproduce the problem, has suggested changing brake controller (but really for lack of other ideas) and agrees that the physical fit/dimensions of the trailer plug itself seem poor quality compared to other trucks - possible cause? Other instances of owners experiencing this problem are documented in this forum thread: https://www.f150gen14.com/forum/threads/trailer-brake-not-working.3039