Honda Civic 2017 Owner's Manual page 528

uuBrakinguBrake Assist System
Brake Assist System
Is designed to assist the driver by generating greater braking force when you depress
the brake pedal hard during emergency braking.
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Brake assist system operation
Depress the brake pedal firmly for more powerful braking.
When brake assist operates, the pedal may wiggle slightly and an operating noise
may be heard. This is normal. Keep holding the brake pedal firmly down.
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