rear axle flexible brake hose questions 1972 dart

I just replaced the front to rear brake line and the flexible hose with the right stuff parts but got them through jegs . the rear axle hard lines are both new that i bent myself . right now i am waiting on a wheel cylinder thats on its way because i broke the bleeder on the old one . now the issue i am having is the brake fluid is coming out of the passenger side of the rear flex hose brass splitter just fine , flowing with no problems . the drivers side can only get a tiny little bit of fluid , just barely coming out at all , pretty much not . one spurt of air once i think , maybe . the drivers side wheel cylinder is off , the drivers side axle brake line is also off , but got zero when it was on too . is there some kind of metering built in ? as i expected the brake fluid to pass through easily . or is it a defect ? or somehow clogged just there ? the old hose is already gone in the trash last week , so i cannot compare them . what am i missing here ? right now the drivers side only is on jack stands , passenger side on the ground , if that makes any difference . thanks for any help .