The brewing assembly (1) comprises a support structure (2) which is operationally stationary and in which the following are mounted: a movable part (4) including a cup-shaped body (5) in which there is defined a receptacle (6) suitable for receiving a capsule (C) or the like containing a substance for the preparation of a beverage; a cooperating locating part (9) provided with a member (10) for performing perforation and/or injecting water and/or steam; and a displacement mechanism (11) for causing displacement of the movable part (4) between an open position, remote from the locating part (9), in which the cup-shaped body (5) is in a position suitable for receiving a capsule (C) or the like, and a closed position, in which the cup-shaped body (5) is able to be coupled with the locating part (9) so as to define therewith a brewing chamber in which the capsule (C) is sealingly clamped, for preparation of the beverage. When passing from the closed position to the open position the movable part (4) performs an initial movement away from the locating part (9) and a subsequent movement during which it substantially pivots about an at least approximately horizontal transverse axis.A disengagement member (30) protruding axially beyond the cup-shaped body (5) towards the locating part (9) is fixed to the movable part (4) and is configured and arranged such that during the subsequent pivoting movement of the movable part (4) its path is able to interfere with a used capsule (C) which may be still attached to the locating part (9) so as to cause it to be detached therefrom.