Porterfield Brake Pad Compounds

R-4 Full Race Compound
The R-4 Full Race Compound is designed specifically for heavy-duty motorsports. The carbon based semi-metallic R-4 materials allow the pad to absorb tremendous amounts of heat and dissipate it at very even rate. Carbon Kevlar material warms up to race temperature quickly, which is quite helpful during restarts, and when track time is limited. When used with cast iron and steel alloy rotors, the R-4 compound requires minimal bed-in period. Throughout the entire heat range, the carbon kevlar material will give extremely consistent modulation and predictably. This is truly the most rotor friendly racing brake pad material ever. Good for road courses, oval track, rally, vintage racing, autocross, club events or professional racing events.

Please see note below.

R4-E Endurance Race Compound
R4-E Endurance Race Compound is a carbon kevlar compound made to last a bit longer than the original R-4 compound. The R4-E compound is designed to endure higher prolonged temperature and still has pad life as long or longer than Porterfield R-4 do. This pad is great for club enduro events and applications where temperatures are at their maximum.

Please see note below.

R4-S High Performance Street and Autocross Compound
For high performance and heavy-duty street conditions. Perfect for prolonged everyday street use while also being capable of tolerating the most severe street use without any fade. Rotor friendly of course. The R4-S friction level will give you an impressive increase in stopping ability with very minimum pedal effort. R4-S compound has the absolute lowest noise and dust levels, far below OEM equipment or any other high performance brake material. Good for autocrossing, some drivers’ schools, and rallies. The R4-S compound is perfect for street driven cars that are used for HPDE and Time Trial track events.
Note: These pads are for racing only, not for street use. Using these pads on the street is essentially dangerous. Race pads require higher levels of heat and friction in order to function properly. These levels cannot be maintained during street driving. These pads will dust, squeal, and may consume brake rotors.
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