One problem related to brake sensor has been reported for the 2012 Ford F-150. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 Ford F-150 based on all problems reported for the 2012 F-150.
2012 f150: replaced the vacuum pump in oct 2016 based on recall and issues with pressing the brake down when starting up. Same issue started again in June 2018. Brought it back to liccardi Ford and they state the issue is "brake booster vacuum pump sensor and pump relay" . They charge me $140 for diagnosis and when I pick up the truck for a second opinion, the "check brake system" warning light is on. I did not have this issue when I dropped it off.