The area of the "braking surface" is flat enough, although it is not a pronounced area like on some wheels...
More info on Corima's site here...
http://www.corima.com/wheels/4-spoke-carbone-wheel.html
I think with many triathletes and TT riders using them there is nothing to worry about, I know Dandy runs one on his bike and uses his brake frequently with no issue.
@TM started
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The area of the "braking surface" is flat enough, although it is not a pronounced area like on some wheels...
More info on Corima's site here...
http://www.corima.com/wheels/4-spoke-carbone-wheel.html
I think with many triathletes and TT riders using them there is nothing to worry about, I know Dandy runs one on his bike and uses his brake frequently with no issue.