The Wilwood Forged Narrow Superlite 4R is a rear big brake kit for the Scion FR-S and its Subaru BRZ twin. Forged Narrow Superlite 4R four piston calipers are combined with BP-10 compound pads and 12.88" rotors in this group of big brake kits for custom high performance Import Cars. The red powder-coated caliper and slotted rotor replace the factory rear hardware. A rear upgrade matters most when you are also running a larger front kit, wheels, and tires, because the stock rear discs are the weak point once the car sees repeated track sessions. Choose this kit over a cheaper pad-and-rotor swap when you want a caliper and disc package built to the manufacturer's spec rather than mixed parts. It is designed as a rear big brake kit for OE parking brake applications.
Fitment is the first thing to confirm. The manufacturer's own catalog pages reference KIT,REAR,2012 SCION FRS, while its FR-S configurator page is set to a 2015 base model, so verify your exact model year before ordering. The kit ships with Line Kit · 220-12862 listed in the manufacturer's configuration. Owners on user forums describe the rear swap as a manageable weekend job: back the parking brake adjuster all the way off, which lets the rotor slide over the shoes. Plan on a full brake fluid flush and pad bedding afterward.
Search terms for this kit include Scion FR-S rear big brake kit, Wilwood 140-12871-R, FR-S red 4-piston rear caliper, BRZ 12.88 rear rotor upgrade, and 17-inch wheel rear big brake kit fitment.
The manufacturer lists a minimum wheel diameter of 17 inches for this kit.
The manufacturer names this kit as a rear big brake kit for OE parking brake applications, so the factory parking brake function is intended to remain in use.
The manufacturer's listing for this kit shows line kit 220-12862 as part of the configuration, and the product title indicates it comes with lines. Confirm the included lines with the manufacturer before ordering.
This is a moderate-difficulty job best suited to someone comfortable with hub-level brake work. Owners on user forums say the stock rear rotors come off after the parking brake adjuster is backed off, and the OEM calipers are removed from the hub with two bolts each. Plan to have a bleeder wrench, torque wrench, jack stands, and fresh brake fluid on hand. Flush the system after the line swap, and bed the new pads before track use. Wilwood publishes assembly instructions for this kit, so check those before starting.
