Hard Braking measures your ability to anticipate and drive in control. Sudden stops will appear as Hard Brake Events on a trip.
The occasional Hard Brake is totally fine; there are always times when a cat jumps into the street, but in general, these events should be fairly infrequent. Your Hard Braking score (0-100) is based on how often you record an Hard Brake Event, so keep your count down to keep your score high.
6.58 mph/s (or 10.59 kmh/s) - in other words, if you were going about 65 mph on the freeway and came to a complete stop over 10 seconds, that’s how hard you’d be braking.