Parking brake for wheels, in particular for wheels of multi-purpose trolleys

A parking brake for wheels, in particular for wheels of multi-purpose trolleys, said brake consisting of a rocker lever (2) pivoted on the hub (4) of the wheel (6), said hub being supported by a fork-shaped foot (8), characterised in that an arm (12) of the rocker lever (2) is provided with at least one wedge-shaped flange (34) removably insertable between the sidepieces (24) of the foot (8) and the lateral band (42) of the wheel (6).