Actually if you want to improve your braking by a great deal then I recommend a two step process. First you should buy some replacement pads that come with a cartridge type pad (handily enough Kool Stop makes one of these, and it even comes with replacement pads
kind of looks like these). Second replace the pads with Dura Ace cartridge pads. There you go, now your braking is super long lasting and quite effective even in the wet.