My friend is building a truck and bought a new TCI chassis with all new brake lines. They are stainless with all 37* flare AN fittings in aluminum. They have the tube sleeves for hard lines and, boy, does it look neat. Has anyone here done that? I read somewhere that you should use only steel tube sleeves and nuts on brake lines but his came all pre tubed from TCI using aluminum sleeves and nuts on the stainless lines. Even the check valves are aluminum (and those are specifically for brakes).

Any input from the community here?

Thanks in advance.