Porterfield R-4 00-09 S2000 Rear Brake PadsDesigned specifically for heavy duty motorsports, the Porterfield R 4 brake pad was our first and is our original Carbon Kevlar brake pad. Being able to maintain an average of a . 50 friction level within a very wide temperature range gives the R 4 pad astounding versatility and makes it very suitable for a wide array of various track conditions. With use of the latest ceramic technology, the Carbon based semimetallic R 4 materials allow the pads to
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