Driving vehicle on country roads at approximately 30mph, a low brake fluid warning was observed. Stopped vehicle and checked, fluid was near min fill line in reservoir. Turned around to return home and within less than 1 mile all brake function ceased and upon coasting to stop, brake fluid reservoir was checked again and found empty. Checked under vehicle and at each brake cylinder, found no indication of leaking. Had truck towed to dealer (timber Ford, hayward wi). They confirmed the issue was an internal leak of brake fluid in the master cylinder. Replaced brake master cyclinder, brake booster and brake vacuum pump assembly for $1000.76 vehicle had 59,663 miles at the time of service. I was able to manage my way back home using downshifting and emergency braking, however, this condition would have been very dangerous if I would have made it another mile further and been on the highway at high speed and more traffic.

- Oakdale, MN, USA

On the morning of July 6, 2018, while driving from swan valley, id to Idaho falls, id I experienced complete brake failure. The warning light indicated low brake failure. I thought that I needed to add brake fluid and had no idea that I did not have any brakes. When I tried to slow down, the brake petal went to the floorboard. I was shocked at that time. I put the gear shift into M and downshifted from about 60 mph to a safer speed. I had to drive 30 miles to the nearest dealership for diagnosis and repair. I had to use the emergency brake at least 5 or 6 times to slow the vehicle to a stop. Most of the 30 miles was on a two lane us highway 26. In order to deal with less stop and go situations, I drove on highway 49 to us 20 to complete by drive to broadway Ford on broadway in Idaho falls. I was able to carefully drive to the dealership and they said they know of similar failures and it involved the master cylinder and a booster. The representative said that their was a recall on the 2013 and 2014 models, but not on the 2015 as of yet. From a personal note if my wife had been driving the truck I am confident their would have been an accident

- Swan Valley, ID, USA

Got the brake fluid warning and then within 5 minutes the brakes were gone, the pedal went straight to the floor while driving. Complete loss of braking thereafter need to be towed to dealer.

- Ponte Vedra Beach, FL, USA

While driving on a city street, brake level low light illuminated followed by total loss brakes when attempting to stop. Checked master cylinder and it was empty. Added fluid to the full line and it continued to drain away. Problem was fluid leaking into the brake booster. A similar problem was experienced in the 2013-2014 F150 which resulted in a recall by Ford. Problem occurred today (the fourth of July). All repair shops were closed so no repair cist are available yet.

- Enterprise, AL, USA

Driving at a highway speed of 65 mph, the brake fluid light appeared. I began to slow down, using the brakes to pull over, , within a few minutes I lost all brake ability when the pedal went to the floor. I was able to coast to a safe location and look at the brake fluid reservoir which was empty.

- Denver, CO, USA

On June 15, 2018 I had a tone alert and message on the dash of my 2015 F150 appear while the truck was in motion indicating a "low brake fluid" warning. I applied the brake pedal and it appeared to be normal. I traveled a short distance to a parking lot and stopped. I returned after 20 minutes and when I stepped on the brake to start the truck the brake pedal went all the way to the firewall. I raised the hood and saw about 1/8 inch of fluid in the reservoir. I called aaa having the vehicle towed to tri-lakes Ford in branson Missouri. The diagnosis was master cylinder and brake booster failure.

- Jefferson City, MO, USA

While using the adaptive cruise control on my 2015 Ford F-150 (king ranch), my truck will confuse a dump truck as a stopped or slow moving vehicle in front of my truck. This will happen if a dump truck is in the lane beside me or in opposing lanes. This occurs at sow and high speeds. Multiple times this has occurred at 65mph+ in traffic. The truck will very abruptly apply the breaks and the collision warning system will alert. This has almost caused very serious wrecks due to the speeds that it often occurs. This is also not a seldom occurance, it happens every time I pass by a dump truck. It will occur on any and every street. I took the vehicle to a Ford delearship and their solution had no effect on the issue.

- Jacksonville, FL, USA

Brake pedal went directly to the floor then the low brake fluid level came on. Thank god I had just parked when it happened. I just drove home from a 2 hour long highway trip with my kids in the car. I guess I could be considered lucky that it happened when I parked and not going 75 mph.

- Dover, PA, USA

The contact owns a 2015 Ford F-150. While driving 70 mph, the brake pedal was depressed, but failed to stop the vehicle. In addition, the low brake fluid warning indicator illuminated. In order to stop the vehicle, the emergency brake was applied. The contact also mentioned that he had to drive with the emergency brake applied until he reached his destination. The vehicle was not taken to a dealer or independent mechanic for diagnostic testing or repair. The manufacturer was made aware of the failure. The failure mileage was 104,167.

- Wadsworth, OH, USA

I lost all break function while traveling 40 mph and had to use my E-brake to come to a stop. Ford and my local Ford dealership admit that the issue was a defective brake fluid master cylinder.

- Fort Worth, TX, USA

I was driving on a city street when my brake fluid warning light came on. I stopped in a parking lot to check the brake fluid reservoir and discovered it was almost empty. When I restarted the truck the brake pedal went completely to the floor, so the truck had to be towed to the closest auto center because there was no braking ability! we were informed that the brake master cylinder had failed - the brake fluid was leaking into the brake booster sensor. A brake master cylinder should not fail on a new vehicle that has only been on the road 2.5 years and driven only 48,000 miles!

- Houston, TX, USA

While driving my truck on the highway at 65 mph, I entered the off ramp and applied pressure on my brake pedal. My brakes failed and the brake pedal went to the floor. I quickly applied my parking brake, locking up the rear wheels. With no load in the bed of the truck, I slid for what seemed to be hundreds of feet before coming to a stop. Fortunately, there was no one in front of me during the skid. I took it to a tire repair vendor close by, and they diagnosed it as a master cylinder failure that also ruined the brake booster. I called Ford customer service, and opened a case for my vehicle. I have read that the 2013 and 2014 models of the F150 with the 3.5L engine were recalled for this problem, but that 2015 models such as mine have not been included as of this date.

- Louisville, KY, USA

The contact owns a 2015 Ford F-150. While driving various speeds, the vehicle leaked brake fluid from the master cylinder in the brake booster. The low brake fluid indicator illuminated and the brake pedal traveled to the floorboard when depressed. Autonation Ford of littleton in littleton, Colorado was made aware of the failure. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was 51,000.

- Highlands Ranch, CO, USA

2015 F150, lariate, crew cab. Completely lost the brakes without any warning, pedal went straight to the floor, warning lights came on. Had to hit the ditch to avoid slamming into the back of a school bus.

- Houma, LA, USA

While in motion at highway speeds, our F-150 lariat supercrew 4X4 experienced complete loss of braking power. After filling the reservoir with recommended dot-4 braking fluid, the vehicle was driven carefully to the local dealership, harrold Ford in sacramento. Upon inspection, the technician in the service department (vincent) diagnosed a faulty master cylinder, leaking fluid into the booster behind. In addition to the master cylinder, the booster and diaphragm are also recommended to be replaced at a cost of over $1,000. The vehicle has 39,000miles and is lovingly cared for.

- Sacramento, CA, USA

Driving down the highway a brake fluid low message came up on my computer screen. I immediately tested my brakes and they still worked so I planned on pulling into the next service station to check the fluid level and possibly purchase more fluid. Upon having to slow down a little further down the road I pressed on the brake and the pedal went to the floor. I immediately started to depress the emergency brake and throttle it until I was safely off the road and could put the vehicle in park. I was towed back to my service station where my mechanic looked at the problem. My mechanic told me the master cylinder had failed and leaked into the brake booster. My mechanic replaced the master cylinder. I do have an extended warranty with Ford and after starting the process to get the work covered under warranty I have been receiving the run around. I will be trying a different dealership today.

- North Haledon, NJ, USA

After about 35,000 miles I started noticing a vibration when I applied the brakes. Took to a Ford dealer who inspected the brake pads and rotors and was told everything was fine. Took to christian brothers one month later and was told the rotors were warped and needed to be resurfaced. 80% of my driving is interstate travel with very little stop and go. I also do not drive around with one foot on the brake all the time. Therefore my guess is that this was caused by a design problem of some sort. Rotor should obviously last much longer.

- New Braunfels, TX, USA

Complete brake failure, all brake fluid leaked out with no sign of a leak. While driving on highway received a low brake fluid error on the dash and upon pressing the brakes they went all the way to the floor 2015 Ford F150 king ranch with 51,000 miles.

- Keller, TX, USA

Warning light about low brake fluid followed by total loss of pressure in the pedal. Technician diagnosed a faulty master cylinder. Vehicle was in motion as I was driving my 7mo daughter to day care. Lost full pedal as I was turning in the parking lot.

- Santa Rosa Beach, FL, USA

I was driving my truck and the brake pedal went to the floor and brake light warnings on dash came on. Brake fluid resivoir was empty. Checked every brake line and connection, all were totally dry with no leaks anywhere. I read online this is very common and I am not seeing any leaks because the master cylinder is leaking and filling up the booster. I am going to call the dealer on Monday but I have 50K miles so it's out of factory warranty and I do not have an active recall, seems many others are having this problem and it's a critical safety concern and the truck cannot be driven as is.

- Land O Lakes, FL, USA