Just did a drum to KH disc conversion. Went to bleed the brakes and had multiple problems. The proportioning valve I bought from Summit leaked from the top nut so I tightened it down and it improved things but still couldn't get it to stop leaking all the way. It also leaked where the line going to the rear end screws into it. I took it out and reseated it multiple times and it leaked every time. I'm returning the part and I'll buy one from inline tube. I'm not so concerned with the top nut leaking because I assume that'll be fixed with the new prop valve but the line going to the back leaking has me worried because I'm not sure if that's a problem with the Summit prop valve or with my line itself. I'm using a small vacuum pump bleeder for the first time ever. I've always done it with 2 people in the past. So I'm just trying to see if it works on the front calipers. I pumped it up to create vacuum, broke the bleeder screw loose, it spit a little bit of brake fluid into the line and then I closed the bleeder screw. At this point, there was still a little bit of brake fluid sitting in the tube right at the bleeder screw but I could see it continue to bubble until I released the pressure on the vacuum pump. I went to the other caliper and it did the exact same thing. I'm guessing I have bad bleeder screws that aren't quite closing all the way when tightened? Anyone ever have this happen? Seems odd to me.