The Aerorotor is also fully floating. Special shouldered bolts allow for about 0.012″ of an inch free float between the hat and the rotor friction ring. This helps prevent cone-like distortion under the heat of hard use like conventional one-piece rotors experience. Floating the rotor also helps reduce caliper piston knockback which can cause an intermittent soft pedal caused by free play in the hub or heat-related warpage of the rotor friction ring itself.
To prevent the rotor from rattling around on the shoulder bolts, special conical Inconel washers give the rotor a little preload while still allowing the all-important float.
The STR42 caliper weighs 3.3 lbs vs the stock calipers 9 lbs. This is a significant reduction of unsprung weight! After CNC milling, the caliper is then hard anodized for corrosion and heat resistance, it won’t burn off like regular powder coating. Stoptech calipers come with many different pistons sizes so that the OEM hydraulic proportioning can be maintained for perfect brake balance and identical to OEM ABS operation.
A lot of aftermarket big brake kits seem to have too much front brake bias and long mushy pedals, not so for Stoptech! Stoptech’s ability to finely tune piston size is what makes Stoptech among the best brake systems for the stock hydraulic and electronic systems of any big brake upgrades.
Since this is a racing use kit, the Stoptech caliper doesn’t have dust boots like most Stoptech calipers which is ok if you service the calipers all the time which is normal for a race car. They don’t have dust boots because they tend to burn up under track conditions. Stoptech caliper seals are back from the face of the piston so they are not directly exposed to as much abrasive brake dust as normal so they are still long lasting.