won't start clicking gives a brake message on console

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. So sorry to hear you're having trouble with your vehicle. If your MKZ won't start and you hear a clicking sound, it could be related to a weak battery. The clicking often indicates that the starter is trying to engage but doesn't have enough power. A message about the brake system can also appear due to low system voltage. The battery might need to be charged or replaced if it is weak. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!