Porterfield Brake Pads for 2004 MERCEDES-BENZ SL65 AMG - w/Iron Discs Compound:R4-S That's the whole point of

That's the whole point of the red media — you can visually inspect it from outside the air box and see when dirt buildup is heavy enough to warrant a swap

but road exposure will dull the finish over time

If your wheels specify a different lug nut pattern or seat type

Will these work with my factory wheels or only aftermarket rims

Aluminum and steel lugs torque the same

Porterfield Brake Pads for 2004 MERCEDES-BENZ SL65 AMG - w/Iron Discs Compound:R4-S That's the whole point ofPorterfield Brake Pads for 2004 MERCEDES BENZ SL65 AMG w Iron 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