Some Hyundai Elantra owners report experiencing recurring issues with rear brake and signal lights malfunctioning, often due to a variety of electrical and mechanical problems. These owners have noted that a malfunctioning alternator or weak battery can lead to electrical quirks affecting the brake lights. Additionally, common causes include a faulty brake light switch, wiring shorts, or issues within the vehicle's computer system. Some have found that damaged fuses, burnt-out bulbs, and worn wiring harnesses can cause brake lights to stay on unexpectedly. Signal light problems may arise from similar wiring issues, bulb failures, or electronic malfunctions. To avoid safety risks, it is crucial for owners to address brake light issues promptly, which may involve testing the brake light switch and checking for wiring problems. Many owners recommend consulting a trained mechanic for a proper diagnosis and repair to resolve these ongoing issues effectively.