Air In Brake Line

[Gratefuldiver]

Is it possible to have an air leak in a brake line or connection yet not leak fluid? Ive been trying to bleed my brakes for a couple weeks and I keep getting lots of bubbles up in the master when you release the pedal. Ive bench bleed the master several times (no air at all, even after I get all the bubbles), Ive replaced the master, Ive replaced the rear block on top of the rear axle, Ive replace the rear lines on the axle, yet I cant get the rear to bleed.

This all started when I replaced the rear steel lines with SS that I flared myself and tried to vac bleed. When I kept getting air in MC I replaced with copper/nickel allow thinking the flare was the issue. (I also flare that with eastwood bench flare tool) To be on the safe side I also replace the rear block on the rear end. Only thing I haven't replaced are the rear flex line, which aren't that old but I guess the SS could have crushed the male nipple like it kind of did the brass block on the rear end. I also reused the crush washers on the banjo fitting on the caliper, maybe bad idea. I desperately want to go to a car show on Sat and run Auto X Sun. Any thoughts?



BTW Fronts are fine. Running Wilwood master, Wilwood D154 rear, Baer track 4 front