big-brake-kits

StopTech 81.B38.9941 - Drilled and Zinc Plated Aero-Rotor Kit Front

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This part fits

  1. 2015 BMW M3
  2. 2015 BMW M4
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About this product

Part #: 81.B38.9941

StopTech AeroRotor Replacement Kits ARK are designed to replace your vehicle's original factory rotors, while retaining the factory brake calipers. Although the ARK is the same diameter and thickness as the factory rotors, it offers improved cooling, braking, and handling. The directional, floating AeroRotors allow independent expansion of the rotor and hat without "coning," thanks to elongated drive pin holes. ARK components include AeroRotor friction rings with patented internal vane design, pre-assembled to billet aluminum AeroHats with directional stand-offs that optimize cooling airflow. The patented AeroRotor vane design pushes up to 80 percent more air than factory rotors for better cooling and reduced fade on the track. The aircraft-grade aluminum hats and 2-piece AeroRotors are up to 8 pounds lighter than stock rotors, allowing faster acceleration and deceleration, and improved handling. StopTech AeroRotors are available slotted or cross-drilled. These slots or holes allow better dissipation of heat, friction material and debris, assuring that fresh pad material is in contact with the rotor every time the brakes are applied. An optional anti-corrosion, zinc finish is available for customers in cold climates, where salt and chemicals are used to melt snow and ice. The zinc coating also benefits customers who prefer no visible surface rust on the vanes and outer circumference of the rotors. StopTech AeroRotors are 100 percent made in the USA.

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See what our community says about stoptech products

Emmanuel Monge

188

Emmanuel Monge
2002 MINI Cooper
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What made you choose this particular product?
HYPE
Is this your first time buying from this brand? Did you consider other brands?
yes, first time
Was it easy to install? Any installation tips that will help others?
it was a bit of a pain, using a large adjustable wrench was like using a 20lb sledge when the job calls for tweezers. get a line wrench!
Once you've had a chance to use the product, did it meet your expectations?
i need to sort out my abs unit or booster, pedal feel improves but is not sorted by the SS line gods.
Any additional comments?
line wrenches are well worth it here, don't cheap out or you'll risk cracking hard lines and stripping microscopic fittings
View on Emmanuel's build
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What made you choose this particular product?
Always had good luck with stoptech.
Is this your first time buying from this brand? Did you consider other brands?
No
Was it easy to install? Any installation tips that will help others?
Easy install
Once you've had a chance to use the product, did it meet your expectations?
Great brake feel.
View on Travis's build
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What made you choose this particular product?
Biggest floating disks with 6 pot calipers
Is this your first time buying from this brand? Did you consider other brands?
Yes many but Stop Tech had the whole package
View on Carey's build
AJ VanGorden

237

AJ VanGorden
2015 Subaru WRX
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What made you choose this particular product?
Price for performance offered, work great and didn't break the bank. Car is a daily so no heavy track use...yet.
Is this your first time buying from this brand? Did you consider other brands?
No, have bought slotted rotors for other cars from them as well.
Was it easy to install? Any installation tips that will help others?
Installed myself
Once you've had a chance to use the product, did it meet your expectations?
Yes. Combined with new pads they work great.
View on AJ's build
product page reviews icon 0product page reviews icon 1product page reviews icon 2product page reviews icon 3product page reviews icon 4
What made you choose this particular product?
My OEM rubber lines were simply tired, and what a better excuse to upgrade!
Is this your first time buying from this brand? Did you consider other brands?
Yes, I've heard great things so I decided to bite! Not really, other brands are way too proud of their offerings for not much of a significant difference in my opinion.
Was it easy to install? Any installation tips that will help others?
Kinda! It took much longer than I thought. But doesn't it always?
View on Jonathan's build
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