Namd, we changed the brake fluid a few hours ago and now we have the problem that we did not get the braking system ventilated anymore. (Audi 80 Bj, 91 still drum brakes at the back) At the moment we are ventilating the brakes at the front, but only air comes. We have already tried a lot, so far everything you can do. Even brake fluid is tipped directly into the brake caliper. I am grateful for any help, hopefully we can still get this A And…