There is no "torque" spec. The proper way to do it is to pull the brake calipers (i pull rotors also), measure the torque required to turn the pinion (in inch pounds). Note the torque. Upon reinstallation, go 5 inch pounds more than the original turning torque required to move the pinion.
Another way to do it is to etch a line with a chisel on the pinion/nut before disassembly, and then line them back up after.
Otherwise you'll probably have to replace the crush sleeve.
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