Royal Enfield Bullet Classic EFI Service Manual page 177

Remove the Rear view mirror RH.
Disconnect the Front brake switch wire and
remove the switch from the master
cylinder.
Disconnect the Banjo bolt and the remove
the brake hose from the master cylinder
end
Remove the brake lever pivot lock nut,
brake lever pivot and the brake lever
Remove the master cylinder clamp bolts
and remove the master cylinder from the
handle bar.
Remove the boot and the Circlip from the
master cylinder body.
Remove the conical spring (Piston
compression spring)
07-9