The R-4 brake pad was the first and original pad from Porterfield made from Carbon Kevlar. Being able to maintain an average of .50 friction level within a very wide temperature range gives the R-4 pad astounding versatility and makes it very suitable for a wide array of various track conditions.
The Carbon Kevlar allows the pads to warm quickly up to race temperature, ideal for restarts and when track time is limited. The R-4 Compound requires minimal bed-in and optimum operating temperatures of 450F – 1200F and able to maintain an average of .50 friction level within a very wide temperature range.
Porterfield AP 683 R4 Rear
Our original road racing compound that is very rotor friendly and easy to modulate, has medium friction with a 0-1400 temp range. Optimum temp range for this pad is 450F – 1200F.
Sold in pairs ( Qty 1 = 1 pair )
|Bmw||330 Series (E46)||(00-07)|
|Bmw||M Coupe 3.2L (Z3 M Series)||(06-08)|
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