I feel like I am misunderstanding, or I just need to try driving around the block.Push down brake peddle and hold pull out switch plunger then let the peddle come back up and it will set the correct distance, i had abs fault switch cured it, the switch is a two stage switch with two settings so it knows when the brakes are on and off, worth a try may well save you a lot of brain ache.
So I depress pedal, the plunger I assume should automatically extend to the fullest, as I can't move it any further with just my hands and gentle force. I then release the pedal and that should set the switch?