105 5700 brakes on Sora shifters
I'm going to upgrade to 105 components on my Sora bike. Currently I've only bought the brakes. Santa is bringing other bits 'n bobs (if I've been good). I've read that officially the brakes are not compatible with sora shifters. Why is this - isn't it just pulling a cable? Am I good to put these on my bike now or should I wait until I have the 105 shifters?