Porterfield Brake Shoes for 1968 CHEVROLET CHEVELLE w/Front Discs Performance Pistons What's the difference between this

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Porterfield Brake Pads for 2015 BMW X5 xDrive 35i

Precision bore alignment — Matches OEM gasket pattern to eliminate misalignment leaks during header installation

5:1 compression with 2500+ stall

Porterfield Brake Shoes for 1968 CHEVROLET CHEVELLE w/Front Discs Performance Pistons What's the difference between thisPorterfield Brake Shoes for 1968 CHEVROLET CHEVELLE w Front Discs 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