OK, so I have replaced my brake lines with new spiegler lines and put on new pads. I even went out and bought a new mighty vac to make bleeding easier. I got the front pedal about where I like it, but am having trouble with getting the back to work at all. I have rechecked to make sure nothing is crimped, and nothing is leaking. I have tried bleeding at the ABS unit and get nothing. Pull a vacuum using the mighty vac and vacuum level doesn't drop, and I get no fluid. (Yes the bleeder is open). The fluid level isn't dropping in the reservoir, and so nothing getting to the caliper. Had rear brake before the change...Suggestions Gents?