To offset the added mass of the larger diameter friction area, the center of the StopTech rotor (the rotor hat) is aluminum, shaving pounds off the rotor. Even though the StopTech rotor is significantly bigger, it’s still lighter than the stock rotor which is completely cast iron. This is not just a plain aluminum hat however, but StopTech’s patented AeroHat. The AeroHat uses some raised directional geometry to increase airflow to the outside rotor face, further increasing cooling.
|The rear brakes use Fastbrakes slotted rotors.|
Stoptech two-piece floating rotors with aluminum hats allow the cast iron rotor to expand radially relative to the aluminum hat, minimizing the thermal stress and coning that can happen in one piece and solidly bolted two-piece rotors. The difference in temperature between the hat and rotor with a one-piece cast or solidly bolted on hat can cause the rotor to assume a cone shape at high temperatures. This leads to uneven taper wear of the pads, causing a soft pedal as the pads wear. We had StopTech use rotor hardware that allows free axial float, which reduces piston knockback caused by hub and bearing flex under high cornering loads. When it comes time to replace the rotors, only the outer iron ring needs to be replaced. The aluminum hat is reused, reducing costs.
|The Stoptech brake system is lighter than stock despite being much bigger and more powerful. This is about 3 lbs lighter to be exact.|
The Stoptech brake dwarf the stock Nissan brakes. Although the Stoptech brakes are huge, they are actually about 3 lbs lighter than stock due to the use of aluminum alloys in their construction.
For the rear brakes we use Fastbrakes slotted rear rotors with the stock calipers. Since the front brakes of a nose heavy FWD car like the Spec-V do 80% of the work, the stock rear brakes would work fine with a simple rotor upgrade.