Help, ABS unit wont send fluid to rear breaks

i pulled off moduel on top of the abs unit for the rear and it had presure, but none going into the line. i dont known what to do.

fyi. the brake light is on

i remember reading something about the car cant be jacked up to get fluid to the rears, something to prevent fluid leaks while on a lift or something. I think you have to use a special tool to bleed fluid to the rears if its on a lift, or you have to jack up the rear end itself to bypass the fluid restrictor. not sure though. someone please chime in

i leveled the car and hooked up the traction control unit to the rear and unhooked the batery for 10 min, then it started working....