Porterfield Brake Pads for 2008 BMW X3 Compound:R4-S Are these sealed bearings or

Are these sealed bearings or do they need to be repacked

Lightweight and breathable multi-layer construction

Expect a more aggressive top-end scream and a sharper overall sound profile

It ships ready to use

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Porterfield Brake Pads for 2008 BMW X3 Compound:R4-S Are these sealed bearings orPorterfield Brake Pads for 2008 BMW X3 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 to