Abstract: A system for sensing a malfunction of a drive train and initiating automatic braking of a vehicle comprises an ECU for receiving a signal from a brake pedal and a speed sensor and outputting a signal to a unlocking device, a hazard lamp and an automatic braking device. The unlocking device is mounted between the drive train and wheels of the vehicle to isolate the drive train from the wheels upon sensing of a malfunction of the drive train whereby the vehicle coasts, allowing the driver the opportunity to stop the vehicle, or initiating automatic braking of the vehicle if the driver fails to do so.