(9) Removal of spring (30, brake area) Remove spring (30) from piston (28). Check and record original position of each spring (30) for correct assembling. (10) (10) Removal of brake piston Removal of brake piston When removing piston (28) from housing (1), there is a sliding resistance against tightening of O-rings (14,29). Use tap hole on piston (28) as shown in the pic- ture. (11) Remove O-rings (14,29) from piston (28) and housing (1). (12) Remove friction plate (26) and lining plate (27) from housing (1). 7-11