Abstract: The present invention relates to an improved mechanism (100) for attaching a ground-engaging surface maintenance implement, preferably a front-mounted rotary sweeper (300), to a traction vehicle (200). The mechanism includes a four-bar linkage (102) to "yaw" the implement from an initial position, where the sweeper brush axis is generally perpendicular to the longitudinal axis of the traction vehicle (200), to a first or second position, characterized by the brush axis assuming an angled (i.e., non-perpendicular) orientation, the first and second positions being equal but opposite to one another. The mechanism further includes a central pivot (104) which permits the implement to "roll" or rotate preferably about a horizontal axis perpendicular to the brush axis such that the sweeper (300) can maintain ground contact across its lateral width when traversing laterally uneven terrain.