Wilwood Superlite 4R Rear Brake Kit — 1997–2013 Corvette C5/C6 / 2004–2009 Cadillac XLR, Black, 12.88-inch GT Rotors

The C5/C6 and XLR rear package keeps the factory parking-brake function beneath larger Superlite-equipped discs. This Forged Narrow Superlite 4R rear brake kit combines black powder-coated 4-piston calipers and 12.88-inch GT-slotted rotors. Founded in 1977 by Bill Wood and based in Camarillo, California, Wilwood Engineering designs and manufactures disc brake systems for motorsport, street-performance and specialized applications. Its range includes calipers, brake rotors, master cylinders, valves, fittings and brake lines, selected to work together as a complete brake system.

Technical Details

• Manufacturer part number: 140-8032.
• Rotor dimensions: 12.88 in; 327.15 mm diameter x 1.00 in; 25.4 mm thick.
• Rotor construction: Spec-37 Iron; vented; GT Slotted friction surface.
• Calipers: 4 pistons; forged aluminum; stainless steel pistons.
• Caliper attachment: radial mount; 1/8-27 NPT hydraulic inlet.
• Caliper finish: Black Powder Coat.
• Rotor/hat wheel-stud clearance patterns: 5 x 4.5 in; 5 x 114.3 mm; 5 x 4.75 in; 5 x 120.65 mm.
• Rotor/hat stud-hole clearance diameters: 0.520 in; 13.21 mm. These are hole sizes, not wheel-stud thread specifications.
• The rotor/hat drilling does not change the vehicle hub or axle wheel bolt pattern.
• Housing/flange arrangement: OEM.
• Wheel-size guide: 17 in; 431.8 mm minimum nominal diameter; verify actual template clearance.
• Sold as one kit. Mounting hardware is included. Hubs are not included.
• Brake pads are included; use the compound and installation instructions specified for this rotor package.
• Spindles, master cylinder, brake booster and hydraulic brake lines are not included.

Fitment & Compatibility

The listed Corvette C5/C6 applications span 1997–2013, and Cadillac XLR coverage runs from 2004–2009. This rear package retains the OE parking-brake and ABS functions when installed as directed. Its four-piston Superlite 4R calipers use radial mounting and work with 12.88 x 1.00-inch Spec-37 rotors. DS458 uses a rounded 12.90-inch heading, while the exact current rotor specification is 12.88 inches; the dimensions in this listing follow the current rotor data. Match the specific model and trim entry before ordering and verify the wheel profile against the instruction drawing. The existing rear hubs and parking components should be inspected during installation. Brake lines are separate, and the correct listed flexline reference depends on the vehicle application.

The application table below identifies the model-year and factory-equipment combinations. Match the entire row, including its numbered notes.

Package and installation requirements

• The current rotor specification is 12.88 x 1.00 inches. The DS458 cover rounds the diameter to 12.90 inches.
• Hydraulic lines are separate; Wilwood references 220-8177 and 220-9101 according to the application.

Manufacturer references

• Wilwood product and configuration information
• Installation instructions

PMB Performance brings more than 20 years of brake and parts experience to fitment questions. Send us the axle or spindle details, current brake equipment and intended wheel dimensions if you need help checking this kit.

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.

Vehicle Applications

Application Notes

1. Line kit included (manufacturer): None
2. Rear line-kit reference: 220-8177, 220-9101