What is the fault when the brake light stays on after the car is turned off?

[McLyla]

Here is the fault analysis for when the brake light stays on after the car is turned off: 1. Lack of brake fluid: Brake fluid plays a crucial role in the car's braking system. When the driver steps on the brake pedal, the force applied is transmitted by the piston in the master cylinder through the brake fluid to the brake calipers at each wheel, causing the brake pads to contact the wheels and stop the vehicle. A lack of brake fluid can cause the brake light to stay on. 2. Damaged tail light bulb: The brake fluid reservoir has upper and lower lines. If the brake fluid in the reservoir is below the lower line, the sensor next to the reservoir will detect this and reflect it through the brake light on the dashboard. If the brake fluid level drops rapidly, it indicates a leak in the braking system. 3. Hand brake: Note that if you drive without releasing the hand brake, the light will also stay on. Therefore, check whether the hand brake is released.