Stainless brake line fittings

[gpag]

I need to replace the fittings on my trailer brake line.  When I installed the hydraulic brake I needed to lengthen the line and used a union from the local auto parts store and it rusted fairly quickly.   I am going to replace them all with stainless fittings.   The line itself is the one that came with the disc brake kit.  I believe it is a nickel/copper line.   Do I need to worry about corrosion between the stainless fittings and CuNi brake line?

[freezerfiller]

I wouldn't think so if it came with the kit. You can always spray it down with corrosion-x for a little insurance.