Hello & Welcome to JA,
front or rear brakes ?
Yes,there is a special to wind the pistons back in the caliper. Turn clockwise as you apply pressure on the piston.
The electronic brake pad wear sensors must be replaced every time the brake pads are replaced. New brake pad wear sensors are included with GM replacement brake pad kits.
Important: The caliper piston boot must lay flat. Make sure convolutions are tucked into place.
Tighten Tighten the caliper slide pin to 85 N·m (63 lb ft).
The electronic wear sensor is a sensor with a wiring harness that fits in the brake pad & wears as the pad does ,not all Cadillacs have them.
The spanner wrench or similar tool should be used to turn the brake piston.