Did you try using a small c clamp? You should use the old brake pad and put this against the piston then use the clamp to put pressure on the piston to draw in the piston straight, using a screwdriver may push the brake caliper piston in crooked and bind it up not allowing the piston the retract properly.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.