What is the operational function of Brake Assist (Bremsassistent / BAS) in a passenger car during emergency situations?

1. It automatically shifts the transmission into reverse gear
2. It sounds a bell to warn pedestrians on the sidewalk
3. It detects rapid brake pedal depression characteristic of emergency panic braking and automatically applies maximum hydraulic brake pressure instantly, shortening braking distance before ABS modulates
4. It replaces the vehicle brake pads every 1,000 kilometers