Mounted the brake cylinders...couldn't really clamp...too far inboard. I mounted the brake cylinders between the brackets with a AN3 bolt and installed AN3 light washers on each side of the brake cylinder to give myself a little room to play with final adjustment if necessary. I laid the brackets in place and marked the first hole from below with a sharpie, then drilled that to #40. After clecoing that one I made sure everything was lined up for the second hole...then step drilled to #20. Did this for each bracket, the one on the outboard pilot side...the holes are at an angle so took special care in lining that one up.