How Brake Assist Works (diagram)

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image courtesy of Lexus

1: The driver does not press the brake forcefully enough in case of an emergency. Therefore, not enough braking force is generated.

2: Usually, the driver decreased his/her pressure on the brake pedal after "slamming" it initially, causing a further reduction of braking force.

3: When the driver presses the brake pedal more rapidly then normal, brake assist automatically recognizes the situation as mergency braking and increases the braking force.

4: After the emergency brake situation, when the driver releases the brake pedal, the brake assist system reduces the amount of force simultaneously.