Check fuses first. Probably the brake switch, looks like it is under the hood. See pic .

Directions to remove Brake Switch:
Depress and hold the brake pedal.
Remove the stop lamp switch (2) from it's bracket on the brake pedal assembly (6). To do so, rotate the stop lamp switch in a counterclockwise direction approximately 30 degrees from its proper mounting position. Pull the switch rearward and remove it from its mounting bracket.
Disconnect the wiring harness connector (1) from the switch.