Wilwood Chevrolet 12-Bolt OE Rear Conversion — Red Calipers, 12.19-inch Drilled/Slotted Rotors & Parking Brake

Red calipers frame the SRP discs while an internal drum handles parking-brake duties. At the rear axle, this kit pairs red powder-coated 4-piston calipers and 12.19-inch SRP drilled-and-slotted rotors with the mounting hardware for Chevrolet 12-bolt OE C-clip, 2.75/2.81-inch offset. 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: 140-7141-DR.
• Rotor dimensions: 12.19 in; 309.63 mm diameter x 0.81 in; 20.57 mm thick.
• Rotor construction: Iron; vented; SRP Drilled & Slotted friction surface.
• Housing/flange arrangement: 12 Bolt.
• Axle flange offset: 2.75 in; 69.85 mm; 2.81 in; 71.37 mm.
• Wheel-size guide: 15 in; 381 mm minimum nominal diameter; verify actual template clearance.
• Calipers: 4 pistons; forged aluminum; stainless steel pistons.
• Caliper attachment: lug 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; 5 x 5 in; 5 x 127 mm.
• Rotor/hat stud-hole clearance diameters: 0.52 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 one-piece iron drum/rotors incorporate the parking-brake drums; the internal shoes provide a mechanical parking brake independently of the four-piston service calipers.
• Parking-brake cables and hydraulic brake lines are separate. Wilwood references universal cable kit 330-9371; installation can require cable or vehicle modifications.
• Not for Special housing ends or C-clip eliminators.

Fitment & Compatibility

This Chevrolet package is for the original 12-bolt housing-end design with C-clip axle retention. It accepts the specified 2.75- and 2.81-inch axle-offset arrangements; it is not the fixed-bearing Special-end kit. C-clip eliminators or replacement ends change the mounting requirements and are excluded. Compare the actual end with DS421 rather than selecting from a differential-cover description. The vehicle list includes modified GM applications, but their front spindle qualifiers do not identify the rear housing. Check that rear axle independently. Installation retains the original axle-retention arrangement while adding service discs and internal parking shoes. Brake lines, parking cables, wheel clearance and the hydraulic balance of the complete vehicle must be checked as separate parts of the conversion.

Wheel selection requires the complete clearance profile in the instructions. Confirm radial and spoke clearance; do not rely on the minimum diameter alone.

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
• Technical bulletin

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. For OE C-Clip axles only. Does not support Special End or C-Clip Eliminator modifications
2. Kit may fit some 15" wheels. Check wheel clearance diagram in kit installation instructions before purchase.
3. Universal Flexline kits available: 220-7056 (14"), 220-7699 (16") or 220-8307 (18"). Choose correct length for your application.
4. Universal Parking Brake cable kit, may require modifications to cable or vehicle to install.
5. Line kit included (manufacturer): None