I have a nice set of early 1970s Campagnolo brake calipers on my bike, but they are awfully tough to use. I get almost no braking power by squeezing the levers when my hands are on the hoods, and even in the drops it is tough to get the bike to stop quickly. I am beginning to think this setup is just unsafe. Anybody have any recommendations for how to fix/adjust this problem? My mechanic recommended replacing the brakes with modern ones, but I'll do that only as a last resort.