Wilwood Rear AERO4 and Electric Parking Brake Conversion, Red Calipers with GT Rotors for Small Ford 2.66-Inch Offset

Slotted Spec-37 rear rotors accompany red AERO4 calipers and electric parking hardware. Match the Small Ford flange with a 2.66-inch offset. This conversion keeps hydraulic service braking and electric parking in separate calipers selected for the documented mounting arrangement. Bill Wood founded Wilwood Engineering in 1977 in Camarillo, California, where the company is based. Wilwood designs and manufactures disc brake systems, producing brake rotors, calipers, master cylinders, fittings, valves and brake lines for motorsport, street-performance and specialized applications. Individual parts are selected to meet the requirements of the complete braking system.

Technical Details

• Application / axle position: Rear Brake Kits - Street Performance; rear position
• Rotor specification: 14.00 × 1.10 inches; Spec-37 Iron; vented; GT Slotted
• Supplied service-pad compound: BP-20
• Wheel-size starting point: 18 in; verify the complete clearance drawing
• Flexline inclusion: Not included
• Caliper family, piston count and finish: 4-piston AERO4; Red Powder Coat
• Hydraulic inlet: 1/8-27 NPT
• Housing / axle interface: Small Ford; axle offset 2.66 in
• Rotor / hub bolt-circle specification: 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
• Caliper mounting: Radial; piston material: stainless steel
• Items outside the kit: spindles, wheel hubs, master cylinder, brake booster
• Supplied mounting components: mounting hardware
• Manufacturer part number: 140-16176-R
• Quantity: Sold as a kit.

Fitment & Compatibility

Measure 2.66 inches of axle offset at the Small Ford housing interface and check all flange and bearing-retainer dimensions before ordering. The Town Car table entry below is conditional on the actual axle configuration; do not select this kit by vehicle identity alone. AERO4 hydraulic calipers provide the service brake, while separate motor-operated parking calipers use the supplied controller and wiring harness. Electronic parking does not replace an emergency stopping system. Allow for wiring protection, the two-piece rotor envelope and separately sourced flexlines.

Use the fitment table below to check each listed year, model and brake configuration alongside these installation requirements.

Wilwood product specifications · Installation instructions · Technical bulletin

With over 20 years of parts and fitment experience, PMB Performance can help compare the actual axle flange, rotor relationship and hydraulic arrangement. Share measurements and photographs of the installed assembly before ordering.

Manufacturer warning — brake pads only: WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov.