leaking Brake lines

Stainless lines are made of harder steel than the standard lines. My experience with them is that you have to tighten and untighten them a few times and be patient. Also look at the ends carefully to see if they were formed/flared properly, with no burrs or such. More than likely they will end up having to be tightened more than you think. Also, as stated above , do check for wrong angles.