Porterfield R4-1 Carbon Kevlar Racing Brake Pad AP 372 R4-1

Porterfield Carbon Kevlar R4-1 Racing Brake Pad:  AP 372 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 372 R4-1 applications are Stoptech ST-40 Calipers. Porsche (993) 911 Carrera 2, (964) 911 Carrera 2 Turbo Look, (964) 911 Carrera 2S, (993) 911 Carrera 2 Turbo Look, (993) 911 Carrera 2S, (993) 911 Carrera 4, (993) 911 Targa 4, (993) 911 Carrera 4 Turbo Look, (993) 911 Carrera 4S, (993) 911 Carrera 4 Targa 4S, (964) 911 Turbo, (993) 911 Turbo, 928 CS, 928 GT, 928 GTS, 928 S, 928 S4, 944 Turbo and 968 Sport..