Why does the brake warning light come on when stepping on the brake?
2 Answers
The reasons for the brake warning light coming on are: 1. Insufficient brake fluid; 2. Brake pads worn to the limit; 3. Short circuit in the brake warning light circuit. The function of the brake is to reduce speed or stop the vehicle. Its working principle is to convert the kinetic energy of the vehicle into heat energy through friction between the brake pads and brake drum, as well as between the tires and the ground, thereby slowing down or stopping the vehicle. The maintenance methods for brakes include: 1. High-temperature protection to prevent corrosion of the brake system, avoid brake pads seizing due to high temperatures, and eliminate brake squealing; 2. Regularly replace brake fluid; 3. Clean the brake discs, brake drums, and any parts from oil stains, dirt, and friction dust to ensure good heat dissipation of the brake discs; 4. Regularly check the thickness of the brake pads or brake shoes.
A lit brake warning light is no small matter. I've encountered it several times, and each time it felt like an immediate fix was necessary. The main issues are various faults in the braking system: it could be that the brake fluid level is too low, with insufficient pressure due to low fluid; or the brake pads might be worn too thin, triggering an automatic sensor alert. There could also be a leak in the hydraulic system, such as a ruptured brake line. Additionally, sensors can sometimes malfunction, like getting wet or having poor electrical connections. The most severe issue is a failed brake master cylinder, which requires urgent repair. My advice is not to drive recklessly—first, find a safe place to stop and check the brake fluid reservoir level. If it's below the minimum line, top it up; if not, head straight to a repair shop. Continuing to drive risks brake failure, which is extremely dangerous. Regular maintenance, like periodic brake fluid and pad replacements, can save a lot of trouble. When this light comes on, it's essentially the system giving a warning—don’t delay, or repairs will become more expensive and unsafe.