While I would agree on the disc brakes, I did ride a Riv Rambouillet with Tektro calipers in the Bavarian Alps last summer on a two day trip. I only had a Carradice on the back and a Berthoud on the front. The Tektros were fairly efficient overall, but man, we got those Kool Stops good and steamy at times.

If it was pouring it would have been more than nice to have discs.