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On the front caliper of a 97 grand prix do you compress piston with c clamp or need to turn it in?

You compress the piston on a 1997 Pontiac Grand Prix front caliper using a C-clamp or similar tool. You do *not* turn it. Turning the piston is not how these calipers are designed to work; they use a hydraulic system, and the piston is pushed in by hydraulic pressure from the master cylinder.