An assembly of a vehicle comprises a first vehicle part and a second vehicle part being pivotal relative to the first vehicle part, at least one detent fitting which is constituted to hold the two vehicle parts in position to each other in a locked state and, therein, to establish a force flow between the two vehicle parts and to allow for a pivoting of the two vehicle parts relative to each other in an unlocked state, an actuation shaft for actuating the at least on detent fitting and a free-pivoting mechanics which is actuatable in order to disrupt the force flow between the two vehicle parts for providing a free-pivoting function. Herein, it is provided that the free-pivoting mechanics for providing the free-pivoting function interacts with the actuation shaft and, therein, is constituted to come into operational connection with the actuation shaft only if the free-pivoting mechanics is actuated. The invention further relates to a free-pivoting mechanics for a vehicle seat and a method for providing a free-pivoting function. In this way, an assembly of a vehicle, a free-pivoting mechanics and a method for providing a free-pivoting function for actuating at least one detent fitting are obtained which do no not influence the normal operation of the detent fitting, use a mechanic for providing a free-pivoting function which is of a comparatively simple construction and in a reliable way provides a free-pivoting function.