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@Howard
Disc brake thread, yo.
Not sure I read it right, but you are pushing fluid down into the system, from the master cylinder into the caliper, right?
That seems silly. The air will want to go up.
Give it a helping hand by pushing fluid up and in to the caliper. Install another syringe on to the caliper exit and push fluid back into the master cylinder and out of the bleed port.
Or did I read the manual incorrectly and that's what you are doing?