Porterfield R4-1 Carbon Kevlar Racing Brake Pad AP 919 R4-1

Porterfield Carbon Kevlar R4-1 Racing Brake Pad:  AP 919 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 919 R4-1 applications are Bentley Arnage Red Label, Arnage R, Arnage RL and Arnage T. BMW E60 535i, 545i, 550i and M5. BMW E63/E64 645Ci, 650i and M6. BMW E65/E66 750i, 750Li. E65 745i, 745Li, 760i, 760Li and Alpina B7. E90/E92/E93 M3. BMW F01 / F02 740i, 740Li, 740Li XDRiVE, 750i, 750i XDRiVE, 750Li and 750Li XDRiVE. BMW F07 535i GT (Gran Turismo), 535i GT XDRiVE, 550i GT, 550i GT XDRiVE and 1 Series M rear brakes..