leaking brake fluid

My car has always leaked brake fluid but it used to be about half the resevoir per month, yesterday it leaked half the resevoir in 5 hours. Looking under the hood i cant see it leaking out but i can see the drips rolling off the driver side frame rail(right at the froint where it starts to bend upwards, i believe almost directly under the master cylinder). Car is a 1990 s13 5spd non-abs. Anyone had this problem and have any idea how to fix it. (New seals?, new MC?).

Thanks

check first to make sure it isn’t leaking from any of your brake lines. if the lines are good, then pretty much a new MC would fix your leak.