boyoconnor - the lines are the original steel lines that came on the truck - doc41 - the lines are steel but the threads are brass or at least they are a shinny brass colored metal of some sort - brendanm and tclederman - i believe i will run with your advice and get a little more muscle power behind my wrench and also back them out a few times. i hope that is all there is to it. thanks to everyone that has responded. it will be a weekor two before i have a chance to try again. it is somewhat reassuring that a couple of you have dealt with new lines that leak and that you have solved the problem - hope i can say the same! thanks again!
