What are the reasons for the dashboard brake light always being on?
2 Answers
The reasons for the dashboard brake light always being on are: 1. Wear and aging of brake pads; Worn or aged brake pads may also cause the brake light to stay on. At this time, it is necessary to check the thickness of the brake pads. If the thickness of the brake pads is below the specified value (0.8cm), there is a high risk of them breaking during driving, which could be dangerous; 2. Damage to the brake switch; This situation usually occurs when there is poor contact between the brake pedal and the brake sensor switch or when the sensor switch is faulty, requiring disassembly for inspection; 3. Lack of brake fluid; Brake fluid plays a crucial role in the vehicle'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 located at each wheel, causing the brake pads to contact the wheels and achieve the purpose of stopping the vehicle.
I've been repairing cars for many years, and the dashboard brake light coming on is a very common issue. The most frequent cause is the handbrake not being fully released. If you don't pull it up properly or release it completely after parking, the light will stay on due to the mechanical linkage mechanism. Another key reason is low brake fluid level. When the fluid in the reservoir drops below the warning line, the sensor detects insufficient pressure and triggers the warning light. Failing to top it up promptly can severely affect braking performance or even lead to failure. Faulty sensors themselves can also be problematic, such as wear and tear or loose wiring causing false alarms. Additionally, ABS system malfunctions may also cause the brake light to illuminate. You should pay attention while driving normally. If the light stays on, the brakes may become less responsive, which is particularly dangerous during emergency braking and can easily lead to accidents. It's advisable to visit a reliable repair shop as soon as possible for a comprehensive check of the brake system, fluid, and sensors. Don't wait until an accident happens to regret it.
