Brake Servicing

First thing you need is a nice warm workshop.
Next make sure you have everything you need

When ready remove the blanking cap.
then loosen the pin:
You can then remove the caliper from the bike.
Fully remove the pin and pads and springclip from the caliper.
Then Either using the brake lever or if you disconect the cailper hoese Air pressure to pump out the pistons

This image shows the Seized piston in its origianal position and the piston being pumped out.
Next remove the seals clean the recesses and replace the new seals
the right side shows the front seal .
Ensure the new seals are seated correctly then insert the new pistons.
They are tight but with care can be tapped into the caliper. then reassemble the caliper as you would when changing the pads.
Now all that is left is the process of bleeding the system.