Wilwood Rear Plain-Rotor Conversion, Red Dynalite Service and MC4 Parking Calipers for Modified GM 12-Bolt Axles — Selected 1964–1974 Applications

Red Dynalite service calipers operate alongside separate MC4 parking units in this plain-face rear kit. The 12.19-inch rotors, 2.91-inch axle offset and modified 12-bolt flange must be treated as a matched conversion. Wilwood Engineering, founded in 1977 by Bill Wood, is based in Camarillo, California. The company designs and manufactures disc brake systems and supplies master cylinders, calipers, brake rotors, valves, fittings and lines for motorsport, street-performance and specialized installations. Select each component around the complete system’s requirements.

Technical Details

• Manufacturer: Wilwood
• Manufacturer part number: 140-14224-R
• Kit classification: Rear Brake Kits - Street Performance
• Axle position: Rear Kits
• Brake Type: Disc; Parking
• Selling unit: Sold as a kit.
• Minimum wheel guidance (clearance drawing required): 15 in; 381 mm
• Required rear axle / flange: 12 Bolt C-Clip Eliminator
• Catalog axle-offset reference: 2.91 in; 73.91 mm
• Spindle Included: No
• Mounting Hardware Included: Yes
• Separate wheel hubs included: No
• Rotor Outside Diameter: 12.19 in; 309.63 mm
• Rotor Thickness: 0.81 in; 20.57 mm
• Rotor Material: Iron
• Surface Type: Plain Face
• Rotor construction: Vented
• Bolt Circle Diameter: 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
• Catalog stud / mounting-hole reference: 0.520 in; 13.21 mm
• Rotor surface finish: Plain
• Hat material: Aluminum
• Hat finish: Black E-Coat
• Hat offset dimension: 2.000 in
• Pistons per service caliper: 4
• Service-caliper piston construction: Stainless
• Service-caliper mount: Lug
• Caliper body construction: Forged aluminum
• Caliper Color: Red
• Caliper Finish: Red Powder Coat
• Caliper Inlet Port Diameter: 1/8-27 NPT
• Caliper family: Dynalite
• Pad compound: BP-10
• Master Cylinder Included: No
• Brake Booster Included: No
• Brake Lines Included: No

Fitment & Compatibility

This is a rear axle conversion for modified GM 12-bolt housing ends using customer-supplied C-clip-eliminator bearing assemblies and a 2.91-inch axle offset. The vehicle table's Ridetech front-spindle descriptions cannot establish rear fitment: check the actual axle-end bolt pattern, bearing stack and 3.06-inch registration ring in DS-1184. MC4 parking cables, cable adapters and hydraulic hoses are separate. Verify the non-staggered layout and conditional 15-inch wheel clearance.

Listed models: Chevelle; 442; Beaumont; Camaro; Apollo. Use the fitment table below for the individual years, submodels and equipment conditions.

Wilwood product specifications · Installation instructions · Technical bulletin

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