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Product details
The GT-slotted version of this rear kit uses red Superlite 4R calipers and 1.10-inch vented rotor rings. Its Small Ford Bronco brackets position the service brake around a separate mechanical parking-brake assembly. 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: 140-13321-R
- 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; 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: 17 in; 431.8 mm; verify the individual wheel against the installation drawing
- Rear axle-end interface: Small 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
Verify the Small Ford housing flange and axle register rather than selecting by vehicle name alone. DS1016 defines the 2.36-inch-offset installation and the wheel envelope required around the radial caliper.
A maximum flange diameter of 6.61 inches and a 0.050-inch x 45-degree chamfer are specified for rotor clearance. The illustrated register is 2.88 inches; select the documented centering arrangement and match both axle offset and housing-end bolt pattern.
The installation reference identifies Small Ford Bronco rear applications with 2700-lb axle/10-inch drums for 1966–1973 and 2900-lb axle/10-inch drums for 1974–1975. The measured2.36-inch offset and actual housing flange still govern selection.
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 DS1016
- Axle measurement worksheet
With more than 20 years of parts and fitment experience, PMB Performance can help compare the existing brake assembly with the required component.
