What is the reason for the grinding sound when the brake is fully pressed?

[HopeMarie]

The reason for the grinding sound when the brake is fully pressed is that the ABS (Anti-lock Braking System) has intervened in the braking system. This could be due to slippery road conditions or the activation of the hill descent control function. When descending a steep slope, the same sound may occur. The primary role of the ABS system is to prevent wheel lock-up and loss of steering control, rather than reducing braking distance. It can be understood that whenever there is a tendency for the wheels to lock up, the ABS will intervene. Without the assistance of the ABS system, if the wheels lock up during braking, the rolling friction between the wheels and the ground turns into sliding friction. At this point, the steering wheel can no longer control the direction of the wheels, leading to potential accidents.