Why does the brake light stay on after the engine is turned off?

[DeAlex]

If the brake light stays on, it is mostly due to a malfunction of the brake light switch or a short circuit in the wiring. Therefore, it is generally recommended to inspect the brake light switch and the brake wiring. There are three main reasons why a car's brake light may remain on: 1. Lack of brake fluid: Brake fluid plays a crucial role in the car's braking system. When the driver presses the brake pedal, the force applied is transmitted by the piston in the master cylinder through the brake fluid to the wheel cylinders at each wheel, causing the brake pads to contact the wheels and stop the vehicle. 2. Tail light bulb failure: The brake fluid reservoir has upper and lower level marks. If the brake fluid level falls below the lower mark, the sensor next to the reservoir detects this and reflects it through the brake light on the dashboard. If the brake fluid level drops rapidly, it indicates a leak in the braking system. 3. Brake pads need replacement: Note that if the parking brake is not released while driving, the light may also stay on. Therefore, first check whether the parking brake is released.