What are the reasons for the constant illumination of the car handbrake light?

[LeEzra]

There are several reasons why the car handbrake light remains constantly illuminated: 1. The handbrake may not have been fully released. Even if the handbrake appears to be disengaged, it might not have pressed the switch properly. In this case, the driver should repeatedly check whether the handbrake is fully released. 2. Insufficient brake fluid can also cause the handbrake light to illuminate. When the brake fluid level falls below the safety line, it can result in the handbrake light staying on. There may also be false alarms; for example, when driving uphill or during sudden braking, the steep angle or fluid movement can trigger a false indication from the fluid level sensor. For such occasional alerts, if the brake fluid is indeed low, adding an appropriate amount of brake fluid can turn off the handbrake light.