Abstract: A system for disabling a stolen motor vehicle including a control device and a trigger device. The stolen motor vehicle has a master cylinder housing brake fluid and coupled to brakes by brake lines. The control device controls the flow of brake fluid between the master cylinder and the brakes, initially allowing bidirectional flow of brake fluid. The trigger device triggers the control device to restrict the flow of brake fluid to one direction in response to initiation of the system, tilting of the stolen motor vehicle forward at an angle with respect to ground equal to or greater than a preset angle, and application of the brakes. The trigger device includes a first switch, an operator switch, a motion activated switch, and a brake switch. The first switch is coupled in series between the control device and ground and is initially open. The first switch is operable to activate the control device to restrict the flow of brake fluid to one direction when closed.