Device for emergency braking of a vehicle

The device has a brake plate (2) lowered toward a driving path (3) and supported on a vehicle lower side. The brake plate forms low pressure chambers (4) that are attached at a vacuum pump. A friction belt (6) is provided on a bottom side of the brake plate. The friction belt is permeable to air in an area of the low pressure chambers. The friction belt is engaged at distance in front of the brake plate at a vehicle (1) in a vehicle longitudinal direction. The vacuum pump is designed as a radiation pump that is made to impact with compressed gas via ignitable propellant gas.