Wilwood Rear Superlite 4R Brake Kit for Subaru Impreza WRX (2008–2014), Black Calipers, GT Slotted 12.88-Inch Rotors

This Wilwood rear package uses black Superlite 4R calipers and GT slotted 12.88-inch rotors for the listed 2008–2014 Subaru Impreza WRX applications. The conversion is configured around the compatible original parking brake, with separate rotor hats and included rear flex lines. Four-piston hydraulic calipers provide the service-brake function while the retained parking mechanism requires its own inspection and adjustment. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. The company designs and manufactures disc brake systems and components, including calipers, brake rotors, master cylinders, valves, fittings, and brake lines for motorsport, street-performance, and specialized applications.

Technical Details

• Manufacturer part number: 140-12877
• Type: Forged Narrow Superlite 4R Big Brake Rear Brake Kit For OE Parking Brake.
• Calipers: Forged Narrow Superlite 4R; 4-piston; Black Powder Coat.
• Piston bore dimensions: 1.12, 1.12 inches; stainless pistons. Caliper mounting: radial.
• Included pad compound: BP-10.
• Rotors: 12.88-inch outside diameter × 0.81-inch width; GT Slotted; Iron; Plain surface finish.
• Rotor ventilation: 48 curved vanes.
• Rotor hats: Parking Brake Hat - Standard; Iron; Black E-Coat.
• Wheel bolt circles: 5 x 3.93; 5 x 4.50 inches.
• Included: paired calipers, pads, rotors and mounting hardware, caliper mounting brackets, rotor hats.
• Application-specific hydraulic flex lines included.
• Conditional wheel minimum: 17 inches. Compare the complete wheel-clearance diagram with both barrel and spoke dimensions.

Fitment & Compatibility

Confirm WRX, WRX Premium or WRX Limited coverage for the exact year; the table does not establish general Impreza or STI fitment. Inspect the original parking shoes and hub before assembling the hats. Follow the bracket and shim instructions to align the calipers and check free rotation after parking adjustment. Compare the actual wheel with the 17-inch clearance drawing and ensure hose freedom through suspension travel before assessing front/rear balance.

Match the individual year, model, submodel and equipment conditions in the fitment table below.

Wilwood installation documents: Installation instructions.

PMB Performance has over 20 years of brake-system experience. Contact us with the vehicle and installed hardware details for help confirming the complete setup.

Manufacturer warning, brake pads only: WARNING: This product can expose you to chemicals including Arsenic, Cadmium, Chromium (Hexavalent compounds), Lead, Nickel, Cobalt and Antimony Trioxide which are known to the State of California to cause cancer or other reproductive harm. For more information go to www.p65warnings.ca.gov.