Wilwood Drilled Rear Brake Conversion for Impreza/Forester/9-2X (1999–2008), Black Superlite Calipers

This Wilwood rear package combines black Superlite 4R calipers with drilled/slotted 12.88-inch rotors on the supported Subaru and Saab vehicles. Its hat and bracket geometry is intended for the compatible original rear disc and parking-brake arrangement. The package includes hydraulic lines and the selected pad set, while the retained parking hardware and hub condition remain part of the vehicle-specific installation. 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: 140-12878-D
• 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; SRP Drilled & Slotted; Iron; Black Electro Coat surface finish.
• Rotor ventilation: 48 curved vanes.
• Rotor hats: Parking Brake Hat - Standard; Iron; Black E-Coat.
• Wheel bolt circles: 5 x 3.93 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

Compare model year, trim and rear disc equipment with the precise application row. A similar Impreza or Forester body does not establish that its rear upright and parking system are suitable. Inspect the original hub face before mounting the hats and center the calipers using the instructions. Check actual wheel clearance at both spokes and barrel. After hose routing and parking adjustment, verify that the rotors turn freely and the completed hydraulic balance matches the front brakes.

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.