Our new Stoptech AeroRotor was 35 mm thick and had much more venting than our previous rotors did. The venting in the AeroRotor is CFD optimized to flow the maximum amount of cooling air. Stoptech had calculated that the rotors modest 328mm diameter was enough for our application. These are our front rotors after a whole season of FD competition! With the Stoptech system, our brake wear went from pretty severe to almost non-existent. Perhaps we can now go at least a couple of seasons on one set of brakes vs about two events! The improvement in wear is just that dramatic.
The Stoptech AeroRotors are a light weight two-piece design and have hard anodized hats machined from 7075-T6 aluminum. The hats are free floated to prevent distortion under heat and to eliminate caliper pad knockback if we have any knuckle or bearing system flex or freeplay. Since this is a race application the rotor bolts do not have anti-rattle washers like the street versions of these rotors do leaving the friction ring completely free to float on the hat.
As you can see here, the AeroRotor hats are vaned and vented allowing cooling air to freely pass between the rotor friction ring and the hat. This helps keep heat out of the hubs bearing system and will also help to reduce friction ring temperature.
The calipers are bolted to the front knuckle using a 7075-T6 CNC machined radial mount bracket from maximum stiffness. We had relocated the bracket all the way to the side of the rotor with our custom knuckle to reduce the effects of knockback to the minimum already.
In the rear, the rear brakes were upgraded with larger STR-40 calipers. The STR-40 calipers have all the same features as the front calipers and were sized to have the exact same piston area as our previous system for compatibility with our current pedal box, master cylinders, and balance bar. The race STR calipers do not have dust boots as the street versions do to prevent the issue of the dust boots possibly burning up with hard use.
The rear calipers were held in place with custom radial mount brackets machined of7075-T6 aluminum. This was necessary as the cars custom rear knuckles were originally designed to use ear mounted calipers.