The high mount brake light is out.
Many vehicles typically have 3 brake lights on the rear. One of the left, the right, and a high mounted center light. If all brake lights were out, you may consider a fuse or electrical switch. With one light out, the problem may just be a blown bulb. Have an experienced technician, such as one from YourMechanic, replace the blown out bulb and carry out any repairs needed. It is also a good idea to replace all three bulbs at once to save on labor cost.
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