Where can I find a data sheet for this part? I want to know if there is a magnification factor between the force which acts on the disc brake by pads, and the force that I pull the wire with, as I want to pull the wire with a servo motor. I calculated the force that pads should act on the disc brake, and I want to know the force with which I should pull the wire with the servo motor. Subsequently I can know the suitable torque of the servo motor I can buy to do this this job correctly.
The leverage curve that an individual caliper provides will never be published, but if you have the brake, you have the information. Take the pads out, poke a cable through so that the head is sitting in the housing stop, run it through so that the it's passing by the anchor but not clamped, and then use a fine tip marker to put on 1mm tick marks. Use a locking plier or similar to clamp it at each successive tick mark, and for each one use a vernier to measure the distance between the pistons. Graph that and you have your answer.
The data you're looking for is always a curve, never a ratio, because the anchor is not moving in a straight line towards the housing stop.
