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Product details
The slotted 12.88-inch rear kit pairs black Superlite 4R calipers with iron hats and internal parking-brake hardware. Big Ford Bronco brackets locate the radial calipers at the specified axle offset. Wilwood Engineering has designed and manufactured disc brake systems since Bill Wood founded it in 1977. Its Camarillo, California operation supplies calipers, master cylinders, brake rotors, valves, fittings and lines for specialized, street-performance and motorsport applications. Each component must be chosen to match the complete brake system.
Technical Details
- Manufacturer part number: 140-13323
- Application and package: Rear Brake Kits - Street Performance; Rear Kits; Disc; Parking; Sold as a kit.
- Rotor dimensions: 12.88 in; 327.15 mm outside diameter; 1.10 in; 27.94 mm thickness
- Rotor construction: Spec-37 Iron; Vented; GT Slotted
- Caliper assembly: Forged Narrow Superlite 4R; 4 pistons per caliper; Forged Aluminium body; Radial mount
- Piston and finish specification: Stainless pistons; Black calipers; Black 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: 17 in; 431.8 mm; verify the individual wheel against the installation drawing
- Rear axle-end interface: Big Ford Bronco; axle/flange offset 2.36 in; 59.94 mm
- Included mechanical components: Mounting hardware: Yes; hub(s): No; spindle(s): No
- Hydraulic components supplied: Master cylinder: No; brake booster: No; brake lines: No
- Specified pad compound: BP-10
- Separate rotor-hat specification: Iron; Black E-Coat; offset 1.540 inch; part 170-13326
Fitment & Compatibility
Use DS1018 to verify the Big Ford flange and 2.36-inch offset, together with the 5 x 5.50-inch rotor pattern. Check the complete wheel profile before selecting the separate cables and hoses.
Measure the axle flange and register before mounting the brake: the flange must be no larger than 6.61 inches, with a 0.050-inch chamfer at 45 degrees. Use the instructions for the 2.88-inch register and its centering adapters as applicable, alongside the required offset and housing pattern.
The installation reference identifies Big Ford Bronco rear applications with 3300-lb axle/11-inch drums for 1966–1975 and the listed 1976–1977 configurations. Verify the actual flange,2.36-inch offset and axle register.
Hydraulic hoses/fittings and parking-brake cables, adapters and cable hardware are not included. Choose a compatible cable arrangement for the internal parking brake; universal cable systems may require vehicle or cable modifications.
Manufacturer References
- Wilwood exact kit specifications
- Wilwood installation instructions DS1018
- Axle measurement worksheet
Ask PMB Performance for help comparing the installation requirements. We have more than 20 years of experience working with brake parts and fitment.
