One problem related to clutch pedal/linkage has been reported for the 2013 Ford Mustang. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2013 Ford Mustang based on all problems reported for the 2013 Mustang.
I accelerated from a traffic light, from a full stop. At approximately 20 mph I depressed fully the clutch pedal in order to shift into 2nd gear. The clutch pedal remained in the fully depressed position and did not return to the raised position. The gear shift lever could not be moved into any gear, but could be moved freely within the neutral position. I raised the clutch pedal by placing the tip of my shoe under it and pulling upward, but no change was observed in the operation of the gear shift lever. I could start, and turn off the engine as usual, thus I had power brakes and power steering as I pushed the car and then coasted to a store's parking lot. I had the car towed home. There was no change in the operation of the gear shift lever or the clutch pedal after the car had been parked overnight. The clutch pedal remains fully depressed, unless one raises it. The condition described above has not affected the operation of the starter interlock, thus the engine will not start unless the clutch pedal is fully depressed.