Brake Problem

i was 4x4in today and on my way home i came to a stop light, my pedal went right to the floor! So worried about making it home i poped it in nutral and pupmed the pedal. light goes green and i start moving...i put my foot on the pedal and theres a slight ammount of pressure at the very end of the pedal. I drive a bit more and to the floor it goes...i give it a few pumps and i have slight brake pressure again at the very end of the pedal movement. any idea what this might be. its pissing rain so i didnt check the MC

oh 88XJ 3.5' lift and 32" tires 4.0L I6

you have a leak. fill it back up park it somewhere dry and hit the pedal and look for puddles

that should narrow it down