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The rear caliper pistons need to be turned (clockwise if my memory serves me right) as the are pressed in - otherwise if you force them you can cause damage. When doing the rear pads it is necessary to release the handbrake adjustment and release the cables from their conections at the caliper.
There is a special tool for the job but I have heard of people using a pair of pointy nosed pliers to turn the piston.
See attached link for sample of tool or do a Google for "caliper wind back tool"
Currently in madnoel10's garage:
Honda Civic 1.4l