What does it mean when the ST light on a car is on?

[DeAndres]

When the ST light on a car is illuminated, it indicates a brake light filament failure warning, also known as the brake light filament breakage indicator. The dashboard displays an image composed of an S and a T. When this light comes on, it is essential to promptly check whether the brake light filament has broken and address the issue accordingly. If the brake light filament is intact, the problem may lie with a faulty relay, and it is advisable to contact a service station for inspection. Typically, cars have two brake lights, but some models feature three. In vehicles with three brake lights, the third one is located on the rear windshield and serves as a high-mounted brake light. When the brake pedal is pressed, the brake lights illuminate, alerting drivers behind to maintain a safe distance and helping to prevent rear-end collisions. If the brake lights fail to light up, the driver behind may not realize the vehicle ahead is braking, significantly increasing the risk of a rear-end collision.