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Brakes work by converting kinetic energy into thermal energy via friction, so anything that prevents that will reduce their effectiveness. Even a very fine film of water will act as a a lubricant until it's dissipated.
Similar to what DM7 said, I've found tapping the brakes or lightly dragging them for 1-2 seconds occasionally while driving on very cold/rainy days will help improve the initial bite. BMW even had a system that would detect rain and would very lightly apply the brakes (not enough to upset the car) to keep water off the friction surfaces. This was a few years ago, not sure if it's still in use.
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