Because the factory rubber hoses swell under hard braking, and that expansion softens the pedal right when you want confidence, like towing downhill or coming off a mountain pass with the family aboard. The stainless braided, Teflon-lined Sport Brake Lines resist that expansion for a firmer, more consistent pedal. Each kit is vehicle-specific for the 2021+ Model X with four lines plus crush washers and banjo bolts.
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