As your rubber brake lines age, they start to feel spongy under high brake pressure. Stainless steel braided lines from Brembo, StopTech and others will not have that brake feel. Just a rock solid, rigid brake pedal all day every day.
I always upgrade my brake lines on all my vehicles. I just purchased an 2017 M3 Competition and that's one of the first mods, I plan to do.
