Quote Originally Posted by rowhard
I agree with mbeach on quality pads and rotors, but stainless steel lines are nothing more the rubber hoses with a steel mesh cover. Less chance of blowing or cutting one, but will have no effect on braking performance.
Good quality SS lines (Goodridge or better) will be lined with Teflon. They will not deform under pressure, and they are abrasion resistant. Good ones will also have a Teflon coating on the outside.
They do make a difference.
Have someone step on your brake pedal while you hold one of your brake lines (reach through a wheel). You can actually feel the hose swell as pressure increases. This translates into a "spongy" feel at your foot.

Tone,
Can't you take the piston dimensions (diameter and o-ring groove) and find some nice replacement rings without going through Brembo?