A brush seal is comprised of arcuate seal segments having ends cut in a radial direction with bristles "canted" at an approximate 45.degree. angle relative to radii of the segments, leaving triangular regions adjacent one end of each segment void of bristles at the junction of the segments. The brush seals are retrofit into conventional labyrinth seals with the backing plate for the bristles comprising a labyrinth tooth profile extending fully 360.degree. about the seal, including those areas where bristles are not present or only in the areas where bristles are not present. A support is provided at the juncture of the segments and to which support proximal ends of additional bristles are secured to project at an approximate 45.degree. angle relative to the segments at their juncture. Those additional bristles fill in the triangular region void of bristles when the support is secured to the end of the segment having the void whereby a full 360.degree. array of sealing bristles are provided.