For high-performance and heavy-duty street conditions, Porterfield's R4-S compound remains a leading street-performance brake pad. It provides a friction level of up to .41, delivering rapid stopping performance and an impressive increase in stopping ability with minimal pedal effort. It is suitable for prolonged everyday street driving while remaining capable of enduring severe use without fade, and it is also rotor-friendly.
Porterfield has taken extensive measures to give the R4-S compound the lowest possible noise and dust levels, far below O.E.M. equipment or other high-performance brake materials. The R4-S compound achieved an overall win in the Baja 1000 and is available for most models of cars, trucks and SUVs. It delivers superb stopping power under heavy use and is suitable for occasional autocrossing, solo events, off-road events and rallies. It is designed as a clean, quiet and high-performing everyday brake pad.