£123.57 ex. VAT £148.28 inc. VAT

SKU: AP461.1R4-IMPREZA9316 Category:


Porterfield R4 race rear pads. 2005 – 2007.

The R4S fast road compound:

For high performance and heavy duty street conditions the Porterfield R4-S compound remains
a top performer in the realm of street/performance brake pads. With the R4-S compound
giving a friction level up to .41. This is an amazingly fast stopping brake pad. Simply put, they will
give you an impressive increase in stopping ability with very minimum amount of pedal effort.
Perfect for prolonged everyday street driving while also being capable of enduring the most severe
use without fade. It is also disc friendly of course.

Porterfield have gone to great measures to ensure that the R4-S compound has the absolute lowest
noise and dust levels possible, far below O.E.M. equipment or any other high performance
brake material. The R4-S compound which has an overall win in the Baja 1000 is available for
most models of cars and trucks. Superb stopping power under heavy use. Great for
occasional track days, off road events and rallies. Perhaps one of the overall best
performing, clean and quiet everyday high performance driving brake pad ever made.

The R4-S compound is available for virtually any vehicle sold across the world. Also for rare
vintage cars and special applications for street touring.

The R4 race compound:

For over two decades, the Porterfield R4 Carbon Kevlar brake pad has
given racers abroad a definite world class friction material suitable for
virtually any racing condition. Designed specifically for heavy duty
motorsports, the Porterfield R-4 brake pad was our first and is our original
Carbon Kevlar brake pad. Being able to maintain an average of a .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.

With use of the latest ceramic technology, the Carbon based semimetallic
R-4 materials allow the pads to absorb tremendous amounts of
heat and dissipate it at a very even rate, while at the same time insulating excessive heat from calipers. Another
inherent characteristic of our carbon kevlar material is how quickly the pads warm up to race temperature which
is quite helpful during restarts, and when track time is limited.

Optimum R-4 operating temperatures are 450ºF and above. 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 predictability smooth release characteristics up to threshold.
Another benefit of our R-4 compound is that even
with the high friction levels and broad temperature
ranges, the unique properties of our compound allows
the rotors life to be extended to the maximum. This is
truly the most rotor friendly racing brake pad material
ever. Road courses, oval track, rally, vintage racing,
autocross, club events or professional racing events.
Tested and raced in countless types of competition vehicles,
the R-4 compound from the outset has established its reputation as a Championship winning brake pad

Additional information

Weight 5.0000 kg

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