A9 automatic brake valve we deal in is function as a driving control stand through which vacuum can be simply controlled. The handle of the valve can be kept in release position. It has been engineered to apply as well as release brakes on vacuum brake train. This is a highly compact and self-lapping valve. A9 automatic brake valve is capable of advancing the application or release of locomotive as well as train brakes. The main five positions of the valve are Release, Full Service, Over Reduction minimum Reduction, and Emergency.