Brake Light Switch problems of the 2015 Ford Mustang

The brake light switch function was inhibited due to the plastic retainer mounted on the pedal assembly. The plastic retainer had become brittle and caused it to come apart in pieces. The retainer acts a point of contact for the brake light switch plunger which signals to the ecm when the driver is applying or not applying the brakes. Symptoms of failure are constant illumination of rear brake lights with vehicle on or off. Disables cruise control. Also most importantly it limits throttle control by reducing throttle range spraticly. No driver warnings or lights are displayed or illuminated on the ipc. Problem has been verified and reproduced by independent service center.

My battery died and required a jump the next morning. When I began driving, the car was throttling down as I was attempting to accelerate as if the engine was losing power. I didn't feel safe driving so I returned home and notice that my rear lights including the brake light stayed illuminated even when the car was off. I had to disconnect the battery in order to save my battery from draining again. After some investigating I found the brake switch pad was broken and this is what was causing the brake lights to be on all the time and causing the lack of engine power. This issue was not allowing the car to accelerate because the throttle is over-ridden by the brakes. The car was thinking the brake pedal was being pushed at the same time as the gas pedal. The brake switch pad breaking and causing this problem is very dangerous. I'm so lucky it happened on a local road and not the highway. I've read multiple accounts of this happening to other people. Ford needs to issue a recall and get this fixed to avoid major accidents.

Brake light stop pad broke into multiple pieces while driving, causing the brake light switch to malfunction. Brake lights remained on even when pedal is not depressed, which causes various performance issues due to the ecu believing the brake pedal is being depressed. Brake lights remained on when car was turned off.

While driving up a hill and attempting to pass another vehicle, I briefly lost acceleration. This happened again a few minutes later, and repeated a couple more times. I had never experienced this issue before and there were no warning indicators, or any other signs of mechanical failure. After happening several times, losing acceleration intermittently without taking my foot off the gas, a warning message displayed "hill assist not available," and then disappeared. No other warning messages or dash indicators appeared, and I could not find anything relating to hill assist in my settings. After parking and shutting off my car, I noticed the brake lights remained on- I could not figure out how to turn them off. I searched all of these issues and found a blog post written by another owner experiencing the same issues. The other owner found small fragments of a broken plastic disc on the floor mat, below the petals- I found the same thing in my car. I went to a nearby auto zone for assistance and was advised the broken piece was a "brake light switch plunger. " one of their associates quickly installed a $3. 00 replacement for me, which seemed to fix all of the issues. I have not yet taken my car to Ford, but plan to do so ASAP. Each time I lost acceleration I was traveling up a hill, and it was only temporary- with no other systems appearing to be affected.

The incident took place in last summer. My brake light switch pad broke into pieces while I was trying to merge into a city highway from a freeway. Suddenly I could only accelerate for 2 seconds whenever I step on gas, and I also noticed my brake light never stops even after I turned my car off. I almost got into an accident and got killed. This problem is a very common problem among new Mustang models after 2015. Ford is not doing anything, and they would charge you $200 for the whole brake assembly while I only needed a 50 cents plastic pad. My dad is a car mechanic, and he was surprised that a car in 2015 would have a such common problem in 90s.

A plastic pad attached to the brake pedal arm that's required in order for the brake light switch to operate correctly apparently disintegrated. As a result, the brake lights were on continuously. I noticed it when ithe car was parked at home, but do not know when it happened.