69 Camaro front disc rear drum. New everything. I am starting with the rear pass drum and cannot get anything. Tried the drivers side, nothing. Tried the fronts, bleed out perfect. Removed the distibution valve under the master and replaced with original, no difference. Bench bleed master prior to install. After all this I made a short brake line with a rubber hose and ran it from the brake master (rear) outlet and submerged the other end in a jar of brake fluid, first 12 pumps had lots of air, after that no air but the jar of fluid would not fill up, just raise and drop with each pedal stroke. What I am missing or doing wrong?