Porterfield R4-1 Carbon Kevlar Racing Brake Pad AP 991 R4-1

Porterfield Carbon Kevlar R4-1 Racing Brake Pad:  AP 991 R4-1 

Porterfield R4-1 Carbon Kevlar Racing Brake Pads were developed and tested in the Vintage Racing community. Because of the high coefficient of friction (?) at low temperatures, these are fast becoming the Autocross brake pad of choice. A peak ? of .600 the R4-1 pad can reach close to ? of .500 at temperatures as low as 200?F. The R4-1 brake pads are widely used on Vintage GT and Formula car where pad temps are under 600?F and peak temps are below 1,000?F. This is also a good Rally-Cross brake pad.

Typical AP 991 R4-1 applications are Porsche (997) 911 Carrera 2 Turbo Look and Carrera 2S Ceramic Disc. (997-2) 911 Carrera 4, Targa 4 ceramic disc. (996) GT2 Iron and Ceramic Disc. (997) GT2 Ceramic Disc. (997-2) GT2 and GT2 RS ceramic Disc. (996) and (997) GT3 Iron Disc. (997) and (997-2) Ceramic disc. (997) GT3 RS. (996) GT3 Cup and GT3 Super Cup. (997-2) GTS Ceramic Disc. (996) 911 Turbo Ceramic Disc. (997) 911 Turbo Ceramic and Iron Disc. (987) Boxster, Boxster S and Boxster Spyder w/ Ceramic Disc. Carrera GT Front and Rear. (987C) Cayman Coupe S w/Ceramic Discs Front brakes..