Brake Caliper Piston, Removing And Installing, Dual-Piston Brake: Removing
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-- Force piston from brake caliper housing, one at a time, using compressed air.
Only one piston can be pressed out at a time. Secure opposite piston in brake caliper housing using piston resetting tool -a-. Block the other pistons, for example, using wooden blocks -b-. In addition, place a wooden board -c- in front of the piston resetting tool so that the piston will not be damaged when pressed out.
-- Remove the seal with the Trim Removal Wedge 3409.
When removing, make sure that surface of cylinder is not damaged.