Wilwood Red Four-Piston Rear Brake Package, Impreza/Forester/9-2X (1999–2008), Drilled 12.88-Inch Rotors

Red Superlite calipers and drilled/slotted rotor faces identify this rear conversion for the listed Impreza, Forester and Saab 9-2X models. The four-piston hydraulic package uses 12.88-inch rings on aluminum hats designed for the compatible original parking brake. Wilwood supplies the rear flex lines, pads and mounting components; vehicle-year and original rear equipment still determine suitability. 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-DR
• 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; 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

Distinguish the individual Subaru trims from the Saab application and observe the rear-disc restriction where listed. Inspect hub registration and compare the original parking mechanism with the hat arrangement before installation. Bracket shimming establishes caliper alignment and must be checked with the rotor seated. Use the complete wheel diagram to establish spoke and barrel clearance. Ensure proper parking-brake release, secure the hydraulic lines away from suspension movement and confirm front-to-rear brake 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.