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

GT-slotted rear discs are matched with red Superlite 4R calipers for the listed GM sports-car platforms. At the rear axle, this kit pairs red powder-coated 4-piston calipers and 12.88-inch GT-slotted rotors with the mounting hardware for Chevrolet Corvette C5/C6 and Cadillac XLR. Based in Camarillo, California, Wilwood Engineering was founded by Bill Wood in 1977. It designs and manufactures disc brake systems for motorsport, street-performance and specialized applications, with a range including calipers, rotors, master cylinders, valves, fittings and brake lines. Selecting the mounting and hydraulic components together is part of building the complete brake system.

Technical Details

• Manufacturer part number: 140-8032-R.
• 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.
• Housing/flange arrangement: OEM.
• Wheel-size guide: 17 in; 431.8 mm minimum nominal diameter; verify actual template clearance.
• Calipers: 4 pistons; forged aluminum; stainless steel pistons.
• Caliper attachment: radial mount; 1/8-27 NPT hydraulic inlet.
• Caliper finish: Red 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.
• 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.

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.

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 listed applications below retain their equipment qualifiers. Check the matching row and each referenced note before selecting the kit.

Manufacturer references

• Wilwood product and configuration information
• Installation instructions

PMB Performance has more than 20 years of experience helping customers select brake components. Share the measurements and photos of your current setup so we can help check the application and the additional pieces needed.

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