Yes, you have to do that to unlock the parking brake and keep it off, but because they automatically adjust for the pad thickness as they wear down, it's not possible to push the piston back fully. You have to take off the motor and wind back the mechanism manually.I saw a YouTube of someone doing like a 20k service that put it in tow mode to pull the pads. They then pulled the electric plug so it would not re-engage (Which would be bad if the caliper is off).
This is what I'm thinking. Or maybe there's a hidden service menu where it can be done. What's needed is access to the workshop manual...I tried retracting them electrically and then disconnecting the wire connector. But I still had to retract it manually.
I bet there is probably a way to use a battery even a 9v might work.
Is the only way to retract the piston fully in the rear caliper to take off the parking brake motor and wind it back in?
These OE calipers haven't been designed with track days/racing in mind...