What's the matter with the car brake lights on all the time?

There are three reasons why the car brake light is always on: 1, lack of brake fluid, which is an indispensable part of the car brake system. When the driver steps on the brake pedal, the force stepping on the pedal is transmitted from the piston of the brake master cylinder to the brake cylinder located at the wheel through the brake fluid, so that the brake pad contacts the wheel, thus achieving the purpose of stopping the vehicle from moving forward. 2. The taillight bulb is damaged, and the brake fluid cup is divided into upper and lower lines. When the brake fluid inside is lower than the lower line, this phenomenon will be sensed by the sensor next to the oil cup and reflected by the brake light on the dashboard. If the brake fluid decreases rapidly, the brake system is leaking. 3. Brake pads need to be replaced. Please note that if the handbrake is not released, the light will stay on. @20 19