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What would be the causes of brake lights not working on a mustang?

1. Faulty brake light switch: The brake light switch is responsible for sending a signal to the brake lights to turn on when you press the brake pedal. If the brake light switch is faulty, the brake lights will not receive the signal and will not turn on.

2. Blown brake light fuse: The brake light fuse is responsible for providing power to the brake lights. If the brake light fuse is blown, the brake lights will not receive power and will not turn on.

3. Faulty wiring: The wiring for the brake lights may be damaged, which would prevent power from reaching the brake lights and causing them to not turn on.

4. Faulty brake light bulbs: The brake light bulbs may be burnt out, which would prevent them from lighting up when the brake pedal is pressed.

5. Faulty brake light housing: The brake light housing may be damaged, which could cause the brake light bulbs to become misaligned or loose, preventing them from lighting up properly.

6. Faulty turn signal switch: The turn signal switch may be faulty, which could affect the brake lights as well as the turn signals.

7. Faulty tail light assembly: The tail light assembly may be faulty, which could affect the brake lights as well as the tail lights.