Originally Posted by
SnowJob
I would recommend taking the bike back to the shop and have them make sure they installed the "road disc" version of the BB7s. Perhaps they put the mtb on by mistake. This would mean that you are using short pull levers (your Sora brifters) with a brake that requires a long cable pull.
That's an easy self-check - BB7's are labeled on the caliper. It'll say "BB7_MTN" or "BB7_ROAD."