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@snottyotter
The adjuster on the arm is for pad wear, it moves the pads closer to the rotor by moving the piston in further. If your pads are over half worn you may be at the end of adjustment, mine came a bit underfilled and you needed to start with new pads with a few turns on it, I keep meaning to bleed them and add a touch more fluid to the system, but I'm lazy and just stick new pads in.