Why does the car still roll when the handbrake is engaged?

[Simon]

It indicates a malfunction in the handbrake, usually caused by misalignment or deformation of the handbrake shoe bracket, resulting in reduced contact of the brake shoe's trailing shoe. Here are some precautions for using the handbrake: 1. Avoid pulling the handbrake to 100%: The handbrake's function is to stabilize the vehicle after stopping to prevent rolling and accidents. However, pulling the handbrake to its maximum is not ideal; pulling it to 70%-80% is sufficient. Over-tightening the handbrake can shorten the lifespan of the handbrake cable. 2. Never engage the handbrake directly at high speeds: Engaging the handbrake directly while driving at high speeds is extremely dangerous. Since the handbrake typically acts on the rear wheels, directly applying it can easily cause one of the rear wheels to lock up, leading to skidding or even a rollover.