I installed the 12 inch disc kit. which would requre a caliper bracket unique to that kit, and it appears that the bracket holes were drilled 1/4 inch too far out,resulting in my problem. If the other kits were correctly drilled, they would not display the same problem. When I get a chance. I will weld the holes in the bracket and redrill them 1/4 inch toward the center, which should fix the problem. Mistakes happen, but CPP's poor customer service response and denial of a problem were what I take issue with.
