Why do the brake lights stay on without pressing the brake pedal?

[SpencerFitz]

This situation is generally caused by the brake light switch not returning to its original position or internal rust leading to poor contact. Here are the relevant explanations: Brake lights: Brake lights are usually installed at the rear of the vehicle, with the main color being red. This enhances the light's penetration, making it easier for vehicles behind to notice when the front vehicle is braking, even under low visibility conditions, thereby helping to prevent rear-end collisions. Reasons why brake lights may not work: Bulb damage; short circuit in the wiring, as car tail lights share a common ground wire. If the ground wire is broken or disconnected, the brake lights will not illuminate, so don't forget to check the ground wire; brake switch damage, if the brake light switch is faulty, all brake lights will not light up, in which case it's necessary to inspect and replace any damaged parts.