Porterfield R4-1 Carbon Kevlar Racing Brake Pad AP 683 R4-1

Porterfield Carbon Kevlar R4-1 Racing Brake Pad:  AP 683 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 683 R4-1 applications are Bentley Arnage Green Label, BMW X5. E31 840Ci, 850Ci, 850CSi and 850i. E38 740i, 740iL and 750iL. E39 M5. E45 M3 competition package. E46 330Ci and M3. E60 530i, 530Xi, 530Xi, 535 XDRiVE and 535Xi. E85/E86 Z4. 330i, 330Xi, X3, X5 and Z8..