I claim the ornamental design for a wheelchair brake attachment bracket, as shown and described.
FIG. 1 is a top perspective view of a wheelchair brake attachment bracket showing my new design;
FIG. 2 is a side elevation view thereof;
FIG. 3 is an end elevation view thereof;
FIG. 4 is an opposite end elevation view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is an opposite side elevation view thereof;
FIG. 8 is another top perspective view including a brake shown in broken lines secured to the design;
FIG. 9 is another top perspective view including an alternative brake shown in broken lines secured to the design; and,
FIG. 10 is another top perspective view including the brake shown in FIG. 8 and a partial wheelchair frame and wheel shown in broken lines in combination with the design.
Material shown in the several views in broken lines illustrates variable environmental material and should not be considered part of the claimed design.