I don’t know if that’s universal for ACC, mine will gradually slow down with traffic as long as I don’t have the follow distance set to the minimum. The only times it hard brakes is when someone cuts me off or if the car(s) ahead slam on their brakes, but even in that case it will try to slow down as gradually as it can while eating up that gap.
Also, on hilly terrain it will allow a fair deviation from the set speed before it will try to accelerate/brake more aggressively (usually +/- 5-10 km/h).
I don’t know if that’s universal for ACC, mine will gradually slow down with traffic as long as I don’t have the follow distance set to the minimum. The only times it hard brakes is when someone cuts me off or if the car(s) ahead slam on their brakes, but even in that case it will try to slow down as gradually as it can while eating up that gap.
Also, on hilly terrain it will allow a fair deviation from the set speed before it will try to accelerate/brake more aggressively (usually +/- 5-10 km/h).