Caliper Piston Removing Warning
WARNING: This page is about a different car, the 2018 Chevrolet Cruze. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Do not place fingers in front of the caliper piston(s) in an attempt to catch or protect it when applying compressed air. The piston(s) can fly out with force and could result in serious bodily injury.