A parking brake assembly for the driveline of a motor vehicle is disclosed. The parking brake assembly comprises a locking mechanism, an actuator and an unlocking mechanism. The locking mechanism is able to inhibit and release the rotational movement of a shaft in the driveline of a motor vehicle. The actuator actuates the locking mechanism. The locking mechanism comprises a locking element which is linearly movable by the actuator, and a latching element which cooperates with the locking element. The locking element can be transferred into a first axial position in which the latching element assumes a releasing position in which the shaft is rotatable, and wherein the locking element can be transferred into a second axial position in which the latching element assumes a closing position in which the latching element inhibits a rotational movement of the shaft. The unlocking mechanism forcibly unlocks the locking mechanism. The unlocking mechanism comprises an unlocking element for rotating the locking element, wherein, in the second axial position, the locking element can be transferred into a first rotational position in which the locking element holds the latching element in the closing position, and wherein the locking element can be transferred into a second rotational position in which the latching element can assume a releasing position.