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.

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.

Designed specifically for heavy duty motorsports, the Porterfield R-4 brake pad is able to maintain an average friction level of .50 within a very wide temperature range.

Designed specifically for heavy duty motorsports, the Porterfield R-4 brake pad is able to maintain an average friction level of .50 within a very wide temperature range.

As part of a balanced braking system, use these shoes on the rear of your car when running R4 pads up front.

As part of a balanced braking system, use these shoes on the rear of your car when running R4 pads up front.

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.

As part of a balanced braking system, use these shoes on the rear of your car when running R4 pads up front.

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.

As part of a balanced braking system, use these shoes on the rear of your car when running R4 pads up front.

As part of a balanced braking system, use these shoes on the rear of your car when running R4 pads up front.

As part of a balanced braking system, use these shoes on the rear of your car when running R4 pads up front.