Piston Boot/Piston Removal
WARNING: This page is about a different car, the 2015 Mitsubishi Mirage. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Blow air little by little to remove the pistons. The pistons will rush out if a force of air is applied suddenly.
Cover the caliper body outer side with a cloth or similar materials. Blow compressed air through the brake hose installation area to remove the piston and piston boot.