Wilwood Front Red D8-4 Conversion, 12.19-Inch Rotors for 1976–1977 Ford Bronco Disc Spindles

Red four-piston D8-4 calipers clamp the 12.19 by 1.25-inch plain rotors in this Bronco conversion. Ford disc-spindle geometry is required; a Bronco fitted with GM brake or spindle parts does not qualify. Established in 1977 by Bill Wood, Camarillo, California-based Wilwood Engineering designs and manufactures disc brake systems. Its master cylinders, calipers, brake rotors, lines, fittings and valves support motorsport, street-performance and specialized applications, with each component selected for its role in the complete brake system.

Technical Details

• Manufacturer: Wilwood
• Manufacturer part number: 140-13928-R
• Kit classification: Front Brake Kits - Street Performance
• Axle position: Front Kits
• Brake Type: Disc
• Selling unit: Sold as a kit.
• Rotor Outside Diameter: 12.19 in; 309.63 mm
• Rotor Thickness: 1.25 in; 31.75 mm
• Rotor Material: Iron
• Surface Type: Plain Face
• Rotor construction: Vented
• Bolt Circle Diameter: 5 x 5.5 in; 5 x 139.7 mm
• Catalog stud / mounting-hole reference: 0.640 in; 16.26 mm
• Rotor surface finish: Plain
• Hat material: Aluminum
• Hat finish: Black E-Coat
• Hat offset dimension: 1.450 in
• Minimum wheel guidance (clearance drawing required): 16 in; 406.4 mm
• Spindle Included: No
• Mounting Hardware Included: Yes
• Separate wheel hubs included: No
• Master Cylinder Included: No
• Brake Booster Included: No
• Brake Lines Included: Yes
• 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: D8-4
• Pad compound: PM - ProMatrix

Fitment & Compatibility

DS-1075 specifies the 1976–1977 Ford Bronco Dana 44 disc spindle. Wilwood excludes GM disc-brake/spindle components, including a Bronco converted to that hardware. Check the existing hub register and five-lug pattern, the 16-inch wheel guidance, and the included front hose kit 220-13319 before installation.

Listed models: Bronco. Use the fitment table below for the individual years, submodels and equipment conditions.

Wilwood product specifications · Installation instructions

PMB Performance can help identify the required brake component with over 20 years of parts experience. Send the kit details and original-part measurements.