Parking brake device for a vehicle, having: a control device, wherein the control apparatus has an electronic apparatus, by means of which, in the event of a failure of a power supply system of a vehicle equipped with the control device and the parking brake device during an operation for shutting down the vehicle, at least one activation signal may be output to a triggering apparatus (16, 32) of the parking brake device in such a way that the triggering apparatus (16, 32) may be activated by means of the at least one activation signal and the parking brake device can be changed to a locking mode by means of the activated triggering apparatus (16, 32), the triggering apparatus (16, 32) which can be activated by means of the at least one activation signal output by the control device, wherein the parking brake device is designed in such a way that the parking brake device can be changed to its locking mode by means of the activated triggering apparatus (16, 32), so that the vehicle is locked in its current parking position by means of the parking brake device which is in its locking mode, wherein the parking brake device has an adjustment element (24, 44), and wherein the adjustment element (24, 44) is arranged on the triggering apparatus (16, 32) in such a way that the adjustment element (24, 44) can be displaced from a starting position to an active position by activation of the triggering apparatus (16, 32) such that the parking brake device is in its locking mode when the adjustment element (24, 44) is in its active position, wherein the parking brake device comprises a movable pawl, a locking wheel and at least one spring, characterized in that the parking brake device has a pyrotechnic triggering apparatus (16, 32) as its triggering apparatus (16, 32), and in that the movable pawl can be held in a waiting position spaced apart from the locking wheel by means of the adjustment element in its starting position against a force of the at least one spring, and wherein the movable pawl can be forced by the force of the at least one spring into a locking position against the locking wheel with the adjustment element in its active position, so that the parking brake device is in its locking mode. a control device, wherein the control apparatus has an electronic apparatus, by means of which, in the event of a failure of a power supply system of a vehicle equipped with the control device and the parking brake device during an operation for shutting down the vehicle, at least one activation signal may be output to a triggering apparatus (16, 32) of the parking brake device in such a way that the triggering apparatus (16, 32) may be activated by means of the at least one activation signal and the parking brake device can be changed to a locking mode by means of the activated triggering apparatus (16, 32), the triggering apparatus (16, 32) which can be activated by means of the at least one activation signal output by the control device, wherein the parking brake device is designed in such a way that the parking brake device can be changed to its locking mode by means of the activated triggering apparatus (16, 32), so that the vehicle is locked in its current parking position by means of the parking brake device which is in its locking mode, wherein the parking brake device has an adjustment element (24, 44), and wherein the adjustment element (24, 44) is arranged on the triggering apparatus (16, 32) in such a way that the adjustment element (24, 44) can be displaced from a starting position to an active position by activation of the triggering apparatus (16, 32) such that the parking brake device is in its locking mode when the adjustment element (24, 44) is in its active position, wherein the parking brake device comprises a movable pawl, a locking wheel and at least one spring, characterized in that the parking brake device has a pyrotechnic triggering apparatus (16, 32) as its triggering apparatus (16, 32), and in that the movable pawl can be held in a waiting position spaced apart from the locking wheel by means of the adjustment element in its starting position against a force of the at least one spring, and wherein the movable pawl can be forced by the force of the at least one spring into a locking position against the locking wheel with the adjustment element in its active position, so that the parking brake device is in its locking mode.