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Porterfield R4-1 Brake Pad - StopTech DR21 / Wilwood 7420 Shape for MX5
View #1 61-2979
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Porterfield R4-1 Brake Pad - StopTech DR21 / Wilwood 7420 Shape

2006-2015

AUTOCROSS/LIGHT TRACK

PART NUMBER: 61-2979

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Price: $159.95

Quantity:

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Free shipping offers apply only to destinations within US Lower 48.

Price: $159.95

Quantity:

FREE SHIPPING

Free shipping offers apply only to destinations within US Lower 48.

DESCRIPTION

NOTE: This DR21 / 7420 shape fits StopTech C43 calipers, and Wilwood Superlite calipers. NOT the pad for Wilwood's Narrow Superlite caliper found in the NC 12.88" front kit - that caliper uses the thinner 7416 pad.

Set of four pads.

Please note: These pads are made to order, please allow about 2 weeks.

This high friction racing material has grown to be a very popular choice for drivers who need the highest possible friction with a low pad temperature. Developed and tested in the vintage racing community the R4-1 gives an average coefficient of friction of .56 with peak levels up to .600. Having tremendous stopping power, the R4-1 pad material can reach upwards of .5 friction level when pad temperature is a very low 200 F . Drivers can still have a high friction brake pad without worry of the pad becoming too cold to be effective when the car is driven only moderately. For use when pad temperatures are under 600 F and peak temperatures are not over 1000 F. Widely used on Vintage GT and formula cars the R4-1 has gained great popularity as an excellent auto-cross, off-road and rally-cross pad material. Great modulation, consistent pedal feedback and the same rotor friendliness as our other carbon kevlar compounds.

Brian's Notes: This is THE pad compound I use on my daily driver that goes from streets to track to autocross and back again. Few pads can do it all, and it will make noise when cold but nothing else does it all like this pad.

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