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

GT-slotted front discs are paired with red six-piston calipers in this Corvette conversion. At the front axle, this kit pairs red powder-coated 6-piston calipers and 12.88-inch GT-slotted rotors with the mounting hardware for 1988–1996 Chevrolet Corvette C4. 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: 140-8337-R.
• 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.
• Wheel-size guide: 17 in; 431.8 mm minimum nominal diameter; verify actual template clearance.
• Calipers: 6 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: 0.560 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.
• 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

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

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 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. Front line-kit reference: 220-8338