Abstract: A brake lock system is used in a vehicle having a brake line which feeds brake fluid to at least one brake member. The system comprises a brake line fittable housing having at least one fluid inlet and at least one fluid outlet. A flow control which controls the flow of brake fluid from each inlet to each outlet is provided within the housing. The flow control is movable from a first position which allows two way flow between the inlet and the outlet to a second position only allowing one way flow from the inlet to the outlet. Also provided within the housing is an operating member for moving the flow control. A controller which controls the operating member is provided remotely of the housing and a flexible drive shaft connects the controller to the operating member. The use of the flexible drive shaft permits a mounting position for the controller at a location different from that of the housing within the vehicle.