Take a pencil, stick it down in the slit in your carpet next to the brake pedal, upon removal if it is wet...you have found your missing brake fluid.
Take out your carpet, soak up the fluid with rags in the pedal box and then use something like brake parts cleaner to spray down in there and try to clean everything up. Perfect time to replace the pedal box foam too.
Oh yeah, also replace the leaking bits.
-Ben