If you can't push the piston back in with just moderate pressure or a c-clamp, you either need to rebuild the caliper with a new piston or buy a rebuilt calipers. The brake disc on the piston side of the calipers will never get push back far enough that it is not contacting the rotor and you will wear out that disc again. Plus you will over heat the calipers which isn't very good for the brake or the brake fluid.

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2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD