Abstract: A brake for loom weft yarn feeding device is arranged between a front portion of the drum, on which the yarn coming from a conventional bobbin is wound, and a space defined by a hollow enclosing and covering element. The covering element has a front orifice and is positioned in front of the drum. The element has a substantially cone-shaped or spherical cap configuration, wherein a brake is provided comprising a body of round, oval or possibly even quadrangular plan, consisting of one or more intermediate segmental rings, within approximately semicircular profile, which are fitted with at least one head in a portion of lesser diameter than those of the segmental rings at either end. The weft yarn is comprised and compressed between the rim of one of the heads and the inner wall of the hall element, immediately before exiting therefrom through the orifice.