Table 1 shows one common service brakes related problems of the 2019 Ford Mustang.
| Problem Category | Number of Problems |
|---|---|
| Service Brakes problems |
While driving at normal road speed, the vehicle suddenly displayed multiple warnings at the same time indicating that advancetrac (electronic stability control), traction control, and abs were disabled, and the vehicle entered a reduced functionality state. These warnings appeared simultaneously without any hard braking, loss of traction, or driver input at the time. The warnings and system faults then cleared in a cascading manner over a short distance, with each system returning one after another while continuing to drive, without shutting off the engine. After approximately a few thousand feet, all warning messages disappeared and the systems appeared to return to normal operation on their own. This has occurred more than once since ownership. The first occurrence happened at approximately 50 mph. The second occurrence happened at approximately 20 mph and occurred only seconds before an emergency braking event in the rain to avoid a collision. At the time the warnings appeared, the vehicle had temporarily lost abs, stability control, traction control, and related braking assistance systems, creating a serious safety risk during an actual emergency maneuver. After the events, an obd-ii scan was performed and no stored fault codes or diagnostic trouble codes were present. However, for the next several engine on/off cycles, the steering and traction control behavior felt abnormal, as if the systems were only partially engaged, even though no warning lights or messages were displayed. No permanent warning lights remained illuminated afterward. The problem is intermittent and difficult to reproduce. No collision occurred, no repairs have yet been performed, and the cause is currently unknown.
As I was driving on the highway I slowed down due to traffic and I noticed a drastic change in the brake system responsiveness applying regular pressure to the brakes did not stop the car. A brake system warning message appeared and I had to apply both feet to the brakes to stop the vehicle.
I parked my manual car at work. Put the emergency break on and the break disengaged on its own and 15 mins later the car ran into the metal frame of a pick up truck.
The car is equipped with automatic emergency braking (aeb) which does not work. 2 dealers have found no codes but say they have no way to test on the road. Called Ford and they were no help. Referred me back to the dealer.