Wilwood GT Slotted Rear Brake Conversion, Red Calipers, Subaru Impreza WRX (2008–2014), 12.88-Inch Rotors

GT slotted rotors and red four-piston Superlite calipers make up this Wilwood rear conversion for the listed Impreza WRX applications. The two-piece 12.88-inch rotor assembly uses the compatible factory hub and parking-brake arrangement. Pads, rear hoses and the mounting hardware are supplied for this configuration, with the specific year and trim determining whether the vehicle belongs in the application list. 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-R
• Type: Forged Narrow Superlite 4R Big Brake Rear Brake Kit For OE Parking Brake.
• Calipers: Forged Narrow Superlite 4R; 4-piston; Red 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

Establish the correct WRX trim and inspect any previously modified rear hub or upright. The original parking system must match the hat geometry and remain correctly adjusted. Follow the rotor and bracket assembly procedure before checking caliper alignment. A nominal 17-inch wheel still requires a full template comparison at its spokes and barrel. Confirm hose clearance over suspension travel and assess pedal travel and braking balance alongside the installed front package.

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.