So replacing lines didn't allow fluid to run out far enough to cause a problem? ? Reason I ask is that I have to change the line that runs across the rear axle. I asked a local shop and they said I would have to use the machine, so much for their honesty
They may not be dishonest, you can use a brake flush machine for ease of bleeding all 4 wheels at the same time. It isn't required but it does make it easier.