Q: Why would I replace the factory rubber brake lines on my Model Y?
Almost all mass-production cars, the Model Y included, ship with rubber brake lines because rubber is durable and cheap. The catch is that rubber hoses expand and contract under hard braking, and that swelling shows up as a spongy pedal, which is really a loss of braking capability you can feel. Swapping to stainless lines removes most of that flex for a firmer, more responsive pedal.
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