Shimano disk brakes and groupset

ben-----
ben----- Posts: 573
edited August 2015 in Road buying advice
If I bought a disk brake frame, so far as the groupset and brakes go, I'd be after Shimano 105 5800 and Shimano RS685 hydraulic brakes - I'm not even a 100% sure those two things go together? How much would that cost? What exactly would I need to get? I don't quite understand the interplay / overlap between those two things and when buying disc brakes what exactly is needed?

Thanks.

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