Abstract: An impact braking device adapted for use with the standard braking systems provided in motor vehicles, the device comprising a slidable bumper operably attached to the vehicle frame structure by an actuator means, wherein at least one actuator is provided with a releasable locking lug. A brake cable is releasably attached to the standard vehicle brake pedal at one end thereof, the other end being secured to a spring-biased locking lever which is held in a locked position by said locking lug. When the bumper is moved inwardly, the locking lug releases the locking lever and allows it to rotate under spring tension, thus causing the brake cable to apply sufficient force to operate the foot brake pedal of the vehicle braking system.