Wilwood Drilled Rear Brake Conversion, Subaru Impreza WRX (2008–2014), Black Four-Piston Calipers

Black four-piston calipers and drilled/slotted rear rotor rings are paired in this Wilwood Impreza WRX conversion. Its 12.88-inch rotor and aluminum-hat arrangement retains the compatible factory parking-brake system. BP-10 pads, mounting brackets and rear hoses accompany the selected hardware, which must be matched to the individual WRX model-year and trim rows rather than a generic Subaru application. 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-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; 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

Verify the existing rear hub and original parking-brake arrangement before disassembly. Check that the specific WRX trim appears for the vehicle's year and compare any altered suspension parts with the installation instructions. Set the rotor position and caliper centering, then adjust the parking mechanism so it releases without drag. Use the full wheel template to assess spokes and barrel, secure the supplied hoses clear of moving parts and check hydraulic balance against 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.