One problem related to brake light on has been reported for the 2012 Toyota Corolla. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 Toyota Corolla based on all problems reported for the 2012 Corolla.
Failure of the abs brake controller caused 3 lights on the dash to intermittently light (abs, traction & brake) during all driving conditions. Sometimes the brake light would be off while the abs & traction lights were on, and other times all three lights would be off. A computer scan discovered a short in the abs brake controller.