Before you begin
If the brake light for your 2015 Ford Focus is not turning on when the brake is pressed, it is likely due to a burnt-out brake light. This process does not require any additional tools besides a new LED light bulb. Repairing a tail light is a relatively simple process that people can accomplish at home. Working with light bulbs instills a small risk of injury. Make sure that your car is off, the parking brake is engaged, and nothing is pressing on the brake to avoid injury.