I believe John is correct, the secret for the pedal is to get all the air out ( as always ). On our 2020 Plus Six the ABS acuator block is located under the near side wing, near the windscreen washer bottle and the swirl pot. The actuator blocks on some cars and bikes can sometimes be tricky to purge of air.. I have a hand held vacuum pump designed to pull the fluid and air through the system from the bleed point, works far better than the standard up/down of the foot pedal method. Just have to make sure someone is at the master cylinder topping up the reservoir, because it sure pulls the fluid though quickly.
