Wilwood Red Front Dynapro 6 Conversion for Bronco Dana 30/44 Drum Spindles (1966–1975), 11.75-Inch Hat Rotors

Red six-piston calipers and plain-face 11.75-inch rotors provide this early Bronco front conversion. The aluminum hats attach to compatible existing hubs, and the supplied flexible lines complete the documented brake connections. Bill Wood established Wilwood Engineering in 1977. Based in Camarillo, California, the company designs and builds disc brake systems for motorsport, street-performance and specialized uses, including calipers, rotors, master cylinders, valves, fittings and brake lines. Each part must match the requirements of the whole braking arrangement.

Technical Details

• Manufacturer part number: 140-13303-R
• Application and package: Front Brake Kits - Street Performance; Front Kits; Disc; Sold as a kit.
• Included mechanical components: Mounting hardware: Yes; hub(s): No; spindle(s): No
• Hydraulic components supplied: Master cylinder: No; brake booster: No; brake lines: Yes
• Specified pad compound: BP-10
• Separate rotor-hat specification: Aluminum; Black E-Coat; offset 1.450 inch; part 170-13313
• Published wheel-position / hub offset: +.00 inch per side; verify against the documented spindle assembly
• Rotor dimensions: 11.75 in; 298.45 mm outside diameter; 0.81 in; 20.57 mm thickness
• Rotor construction: Spec-37 Iron; Vented; Plain Face
• Caliper assembly: Dynapro 6; 6 pistons per caliper; Forged Aluminium body; Lug mount
• Piston and finish specification: Stainless pistons; Red calipers; Red Powder Coat
• Hydraulic inlet: 1/8-27 NPT
• Wheel bolt pattern(s): 5 x 5.5 in; 5 x 139.7 mm
• Stud-hole / clearance provision: 0.640 in; 16.26 mm; diameter provision, not a thread designation
• Wheel diameter starting requirement: 15 in; 381 mm; verify the individual wheel against the installation drawing

Fitment & Compatibility

Match the axle rating and original drum size as well as the model year. The required Dana 30/44 drum-spindle geometry is different from the 1976–1977 disc arrangement; check DS1008 and the wheel template.

Documented model groups, subject to each year, submodel and spindle/axle qualification: Ford Bronco. Application distinctions include 2700 Lbs Axle, 10" inch Drum Brakes; 3300 Lbs Axle, 11" inch Drum Brakes; 2900 Lbs Axle, 10" inch Drum Brakes.

Bronco drum-spindle applications: 1966–1973 with 2700-lb axle and 10-inch drums;1966–1975 with 3300-lb axle and 11-inch drums;1974–1975 with 2900-lb axle and 10-inch drums. Confirm the actual axle rating and spindle.

The original hub has a 3.57-inch drum-register step. The wheel must seat flush on the hub face; a separately supplied wheel spacer is needed if that step interferes.

GM disc conversions are excluded. For stock 15-inch steel wheels, DS1008 requires a customer-supplied 0.25-inch-thick wheel spacer in addition to the complete wheel-clearance check.

The included stainless steel braided hydraulic hose kit is 220-13319, listed as 14.00 inches. Route it with adequate steering and suspension clearance.

Kit may not fit all 15" wheels. Check wheel clearance diagram in kit installation instructions before purchase.

Manufacturer References

• Wilwood exact kit specifications
• Wilwood installation instructions DS1008

With more than 20 years of parts and fitment experience, PMB Performance can help compare the existing brake assembly with the required component.

Review the complete application table below with the year, submodel and installation qualifications above.