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StopTech 81.B38.9911 - Slotted 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.B38.9911

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

Tommy Linebarger

378

Tommy Linebarger
2011 Audi S4
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What made you choose this particular product?
Performance
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?
Yes, simple
View on Tommy's build
John Wilson

946

John Wilson
2013 Audi S4
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?
One of the best companies for brake lines. I've used their products before.
What were you trying to accomplish by adding this product?
Better braking feel.
Was it easy 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?
Works great. No leaks.
View on John's build
Joshua Safran

751

Joshua Safran
2015 Scion tC
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?
I have the front rotors done, and performance is phenomenal.
Was it easy to install? Any installation tips that will help others?
I had it professionally installed.
Once you've had a chance to use the product, did it meet your expectations?
Yes. Little to no noise, and low brake dust.
View on Joshua's build
Adam Hoover

1.4k

Adam Hoover
2007 Audi Q7
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What made you choose this particular product?
I tow with this vehicle and wanted a better brake fluid as things get hot when braking with a 6000 pound trailer
What were you trying to accomplish by adding this product?
Keep brake fluid from boiling when braking with trailer
Was it easy install? Any installation tips that will help others?
Did myself, a power bleeder is best, or have a friend pump the brake pedal
Once you’ve had a chance to use the product, did it meet your expectations?
Brakes still work, I'd say it met expectations
View on Adam'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?
Good Products Recommended to me by Sean who races his own GT86
What were you trying to accomplish by adding this product?
Greater stopping power, and heat dissipation
Was it easy install? Any installation tips that will help others?
Very Easy, everything is clean and quick to install
Once you’ve had a chance to use the product, did it meet your expectations?
It did, the pedal feel is good. upgrade to the DOT 4 Fluid as well
Any additional comments?
Don't buy drilled rotors....
View on Craig's build
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