You need to install a star brake washer between the caliper and the frame, or adapter. Also need the park brake caliper tool to hold it in position while you tighten the nut. One trick I've used is after you center the brake, remove the wheel, accuate the brake just to see if both arms move together as they should. They both should squeeze and release the same, if not the brake cable housing could be too long or too short.

Star washer.



Park tool brake wrench, OBW-3



http://www.parktool.com/product/offs...e-wrench-obw-3