Begin by taking off the wheel and tire set-up and after that remove the brake drum. Disconnect the wheel cylinder brake line, remove the return springs of the brake shoes and pull the shoes away from the cylinder push rods. Once done, unscrew the cylinder attaching bolts and lift the cylinder off of the support plate. During installation, surround the cylinder area of the support plate with a bead of sealant, insert the cylinder bolts and tighten them to 20 Nm. Link the brake line to the cylinder, put the brake shoe spring back in and then install the brake drum. After replacing everything, reinstall the wheel and tire and bleed the base brake system.