It was the easy-out itself that snapped. Fortunately the caliper is OK and not leaking. Next step is a full brake job and I'll just replace the two front calipers with new loaded re-builds anyway. Few more bucks but easy enough to do. I now realize the easy-out only sounds easy to use and in fact takes some skill and experience. I may try to drill more and use a pinch for the rest, but new calipers will fix it too :-(