An incorrect driveshaft torsional damper service kit may have been installed, which can allow the damper shield to contact the parking brake cable, possibly resulting in parking brake failure.
Parking brake failure can result in unintended vehicle movement, increasing the risk of a crash.
What to do
Dealers will replace the passenger side parking brake cable with a cable that provides sufficient clearance to the damper shield free of charge.
Owners may contact Ford customer service at (866) 436-7332. Ford's number for this recall is 21S39.