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Porterfield Brake Pads for 1998 BUICK CENTURY 20x9 Do I need to buyPorterfield Brake Pads for 1998 BUICK CENTURY Porterfield R4 Porterfield R4 Carbon Kevlar based brake pads were fully designed for heavy duty extreme motorsports use. Its one of the the few true motorsports competition pads available on the market today. The carbon based semi metallic R4 brake material allows the brake pad to absorb huge amounts of heat and dissipate it quickly and evenly over time. The Carbon Kevlar material also allows the brake pad