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Porterfield Brake Pads for 2005 GMC YUKON XL 4WD 1/2 Ton 4G4RRBF COMP Cams Camshafts K21-212-4 CamShaftPorterfield Brake Pads for 2005 GMC YUKON XL 4WD 1 2 Ton 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