In this schematic the "Shoe,rr.brake (mca)" is used most often.
Check out any of the twenty-one Rear Brake Panel components enlisted.
Parts such as the Rear Brake Panel: Dust-seal, Brake, Washer, Handle, Spring Brake Shoe, Bolt,brake Stop. are included in the Cb250rs 1982 (c) Australia Rear Brake Panel parts fiche.