After reading another post you made, I noticed you're working on your rear calipers.
You'll need to adjust the rear caliper so that it can accept the new and thicker brake pad. To do this, insert a screwdriver (lengthwise) onto the slot that's on the piston head. Rotate the piston 45 degrees.
Once rotated, the piston will retract giving you room to insert the new pad. Once the piston slides back, don't forget to rotate and lock the piston back to its original position before you install the new pads.
Kevin
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