"The brake pedal pivot pin may be missing a circlip, allowing the pivot pin to move and the brake pedal to dislodge," NHTSA said in its recall summary. "If the brake pedal dislodges, the driver may not be able to apply the brakes, increasing the risk of a crash."
There have been no reports of accidents or injuries as a result of this concern, the automaker said in a statement.
The pedal may feel "spongy" when the pivot pin starts to move out of the pedal brackets, Porsche said in a document filed with federal safety regulators.
The affected Cayenne SUVs were built from April 28, 2010 to January 11, 2016.
This is part of a global recall of 409,477 Cayenne SUVs worldwide, Porsche said.
Edmunds says: Owners of these vehicles should make a service appointment with their dealer once they are contacted by Porsche or receive an official recall notice. Those with an immediate concern should contact their dealer now.