Remove the reservoir cap and diaphragm, and pour the brake fluid into a container.
Unscrew the locknut and pivot bolt, and remove the brake lever.
Push the dust cover out of place, and remove the circlip.
Special Tool - Inside Circlip Pliers: 57001-143
Pull out the piston [A], secondary cup [B], primary cup [C], and return spring [D].
Caution! Do not remove the secondary cup from the piston since removal will damage it.