Hyundai Repair Questions? Ask a Mechanic for Answers ASAP
The most likely cause of the brake lights not working would be a bad brake pedal position switch (also known as the brake light switch). Do you have a mutltimeter to do some electrical testing?
It's most likely either the switch is bad or the wire that runs from the switch to the fuse box is rubbed through. About 6 inches above the switch the harness rubs on a bracket.
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Please let me know if you need more info.