A rear brake conversion assembly for all-terrain vehicles is provided. The rear brake conversion assembly may include a leg-and-foot shaped assembly bracket for operatively associating a dual piston caliber braking component with the rear wheel plate by way of a wheel bracket. The leg-and-foot shaped assembly bracket provides a first attachment hole at the hip portion, a second attachment hole at the knee portion, a third attachment hole at the heel portion, and a fourth attachment hole at a toe portion, wherein the leg portion and the foot portion of the leg-and-foot shaped assembly bracket is at an obtuse angle relative to each other.