4 wheel disc conversion Bleeding problems
Hi everyone, first post. Read through a lot of information on the site, but didn't quite get a good sense of how to trouble shoot my issue. I converted a 70 Chevelle to 4 wheel disc power brakes from Right Stuff, but can't get the rear brakes to bleed. Orignally the car had 4 wheel power drums. I've gone through the pump the brakes method, gravity bleeding overnight, and bought a Mity Vac to try and pull some fluid through. The Mity Vac had the best luck, but still didn't pull much fluid through, maybe an ounce or two.
I went ahead and went around all 4 last night with the Mity Vac and did get fluid to pull through the fronts (lots of air still), but I'm stumped on the rears. I cracked the rear line coming from the proportioning valve last night for an hour or so, and didn't see anything drip out. Do, I have a bad Master Cylinder, small holes in my fittings (did use unions to tie new lines from the proportioning valve into the original hard lines) incorrect rod, or some other problem?
Site is great, let me know if you need any other information.