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flat mount calipers are not made to work on post mount frames. There are a couple of special adapters such as these but $$$. you might be better off purchasing a pair of post mount calipers though.
The CAAD10 should be post mounts and if you're using 140 rear the calliper will fit straight on and you'll need one of these for the front :
https://www.planetx.co.uk/i/q/BSAVPPBMBW/avid-post-to-post-brake-adaptor-including-bolts-and-washers
Which callipers are you using though because the r8000 comes with flat mount which wont work with your bike.