I replaced a leaking LSPV on a new to me 96 LC, when I went to bleed the rear brakes I got maybe an ounce of dirty fluid from the PR and very little on the DR. I was able to bleed the LSPV and got good clean flow. Both of the front produce brake fluid when I bleed. I went back and forth from the LSPV and the rear tires and still got very little brake fluid from the caliper bleeders. When I replaced the LSPV I did not cap the lines or anything and they were open over night. I am assuming that their is a boat load of air in the rear lines and that is why I can't bleed anything from the rears. The weird thing is that the car still breaks when I tested them in the driveway. The pedal is soft but has resistant-doesn't go straight to the floor. Before the new LSPV the car drove fine around the neighborhood. The master cylinder always had brake fluid in it, even over night. I'm thinking I need to get one of the vacuum bleeders to pull air and brake fluid to the rear? Is the LSPV defective? Am I defective? Were the rear brakes already in-op? I did not adjust the LSPV for lift or anything, just replaced it.