Good-Win Racing Mazda Performance Parts

Porterfield R4-1 - Wilwood 7416 shape

2006-2015 · Wilwood 6 Piston Superlite


Miata MX5 2006-2015 · Brakes · Brake Kits and Complete Packages

Part Number: 13-1022NC6

Year: 2006-2015

Application: Wilwood 6 Piston Superlite

Price: $146.00


Porterfield R4-1 - Wilwood 7416 shape
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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 . This means you can drive it to/from the track and it will bite on the street when the pads are cold.

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 Porterfield carbon kevlar compounds.

*** Product images may differ from actual product appearance ***


I just installed the Borla exhaust on the MX5. Sweeeeeeet! Thanks, Andy


Thanks for making this work and providing great customer service! I had a full weekend with the install, but man was it worth it. The flywheel was such a good choice. I can't believe how much easier rev-matching down shifts are. The ACT is surprisingly easy to live with, even with the engagement point very low. I'll tackle that when it stops raining. Thanks again for making this happen this weekend.

-- Brian H