Is there a special trick to this? I put in a new master cylinder, and attempted to bleed the brakes, but the pedal is still soft. Bled it again, same outcome. These two times were with an assistant doing the pumping and holding. Read online to try drive it a bit, maybe it'll dislodge an air bubble so I did that. Then bought the Motive pressure bleeder, and tried bleeding it again to no avail. As a last resort I tried draining all the fluid out, pressurized the system with the motive, then cracked open each bleeder valve until all the fluid came out. Then I filled it up with DOT4, and pressurized the system with brake fluid. As fluid came out of each bleeder I closed it, then when they were all done I had an assistant pump and hold while I bled each caliper. STILL mushy/spongy brakes. I am soooo stumped right now...anyone had one of these cars before and had the same problem? Been stuck on this for the past three days...

Thanks in advance!!