Project SEMA Scion Tuner Challenge FR-S: Brakes and Wheels
An internal integrated parking brake makes the rear brakes harder to upgrade but Wilwood’s kit accommodates this giving more braking power and much lighter weight to boot. Like the front brakes, the rear brake kit is all inclusive and complete.
The rear caliper has much smaller stainless pistons to keep the proper brake proportioning with a stock master cylinder.  The caliper features a stiff forged body and stainless steel abutments like the front calipers.
The rear rotors are 327mm in diameter and 0.81″ thick.  This is much larger than stock.  The stock rotors have an integral drum for the rear parking brake and are quite heavy.  The Wilwood kit has an alloy hat with the parking brake machined in.  This saves a lot of weight over stock.  The hard anodized hat can stand up to normal e-brake use but probably not e-brake initiation for drifting.
Wilwood BP10 pads have a super wide temperature range from 100 to 1000 degrees.  The coefficient of friction stays almost flat at around 0.45 for this entire range.  This should give pretty good performance for both street and track use.  Brake pad technology is getting better and better nowadays.
Wilwood 570 brake fluid has a minimum dry boiling point of 570 degrees and a wet boiling point of 313 degrees which reflects what it might be in long term street use.  It also has low viscosity which makes it more compatible with ABS systems.
To begin the installation process, Technosquare’s Howard Watanabe first fastened our rotors to their alloy hats.

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