NHTSA Complaint #11421379 — 2020 FORD EXPEDITION

While traveling at highway speed on I-95 North around 10AM, the vehicle brake quickly and abruptly activated which reduced the vehicle speed by 15-20 MPH. Within seconds, the vehicle returned to previously set speed with Adaptive cruise activated. This incident occurred while passing a tractor trailer truck. The truck was in the center lane and I was passing on the far left lane. As I started to pass the truck, the brake activated when within 10-20 feet of the truck for a moment then returned to previously set speed (75 MPH). This happened so quickly and unexpectedly, I did not notice any warning indicators on the dash display. Fortunately there were no vehicles closely behind me so there was little risk of an accident this time! Due to this incident, I have not used adaptive cruise since nor have I taken the vehicle to a dealer.