Wilwood Superlite 6R Front Kit for 1988–1996 Chevrolet Corvette C4 — 12.88-inch GT Slotted, Black

Six-piston radial calipers and GT-slotted discs make up this C4 Corvette front conversion. This Forged Narrow Superlite 6R front brake kit combines black powder-coated 6-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: 140-8337.
• Rotor dimensions: 12.88 in; 327.15 mm diameter x 1.10 in; 27.94 mm thick.
• Rotor construction: Spec-37 Iron; vented; GT Slotted friction surface.
• Calipers: 6 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: 0.560 in; 14.22 mm; 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.
• 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 six-piston front conversion is listed for Corvette C4 from 1988–1996 with either the factory standard 12-inch front brake option or the heavy-duty 13-inch front option. Both factory configurations lead to the kit’s specified 12.88-inch replacement rotor, rather than retaining either original rotor diameter. Its radial-mount Superlite 6R calipers need clearance behind the wheel spokes as well as around the barrel. Consult DS479 with the actual wheels and confirm the existing hub arrangement before installation. Front flexlines are separate and should be checked for steering clearance. Match the complete model-year and brake-option entry below when confirming the 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

• Front hydraulic line kit 220-8338 is listed separately.

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. Front line-kit reference: 220-8338