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I think that the screwdriver is used to push back the piston AFTER you have removed the pads. Trying to insert a screwdriver between the rotor and the pad is not something I have ever attempted. Remove the pads by drifting out the pins and then pull the pads out. I usually find that the pads are quite tight and have to use a metal bar in the hole where the pins go to lever them out.
I don't use a screwdriver to push back the piston as it may jam the piston; I use a piston retraction tool.
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1959 Bristol 406 (bought in 1972; sold in 1977)
1966 Porsche 2.0 coupe (bought in 1977; sold 1981)
1978 Porsche SC coupe (bought in 1993)
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