Wilwood Rear Big Ford New Style SRP/EPB Package (2.50-Inch Offset), Black AERO4 and 14-Inch Rotors

This 14-inch SRP rear conversion matches black AERO4 calipers to the Big Ford New Style housing and a 2.50-inch axle offset. Electric parking hardware is included, so both the hydraulic connections and electrical installation must be planned. Wilwood Engineering’s disc brake systems and components serve motorsport, street-performance and specialized applications. Bill Wood founded the company in 1977; it is based in Camarillo, California. Wilwood designs and manufactures brake rotors and calipers as well as master cylinders, valves, brake lines and fittings. Selecting compatible components is essential to the complete system.

Technical Details

• Manufacturer part number: 140-18153-D
• Rotor specification: Spec-37 Iron, SRP Drilled & Slotted, vented; 14.00 x 1.10 inches
• Caliper specification: 4-piston AERO4 in Black Powder Coat; radial mount
• Included service pad compound: BP-10; Stainless pistons
• Caliper body material: Forged aluminum
• Hydraulic inlet: 1/8-27 NPT
• Rotor/hat wheel-stud clearance pattern(s): 6 x 5.5 in; 6 x 139.7 mm; match the installed hub/axle pattern
• Housing/flange application: Big Ford New Style
• Required axle offset: 2.50 in; 63.5 mm
• Parking equipment: separate electric calipers, controller and harness included
• Hydraulic brake hoses: not included; select the correct application-specific lines/fittings
• Wheel clearance: 18-inch wheels may fit; verify the manufacturer’s complete caliper/rotor template for the installed wheel
• Supplied as one kit with mounting hardware; spindles, hubs, master cylinder and booster are not included

Fitment & Compatibility

A six-lug Big Ford New Style axle at 2.50-inch offset is required for the 14-inch AERO4/EPB package. Check the large-bearing housing flange and 6 x 5.5-inch wheel-stud layout rather than selecting by vehicle name alone. The retained 1990 Town Car listing cannot establish that its original axle has the required conversion geometry.

Use DS1651 to confirm the 2.80-inch axle register, 6.61-inch maximum flange diameter and 0.050-inch x 45-degree chamfer. Both AERO4 service calipers and auxiliary EPB calipers need wheel clearance. Supplied electronic controls operate the parking system; purchase appropriate service-brake hoses/fittings separately and plan their routing before assembly.

Check the complete application table below, including its model-year splits and configuration notes.

The electric parking brake is for stationary parking, not an emergency-stop brake. Applying it while the vehicle is moving can lock the rear wheels and cause a skid. Follow the wiring and holding-test procedures in the manufacturer’s instructions.

Manufacturer Resources

• Exact Wilwood kit specifications and wheel-clearance information
• Installation instructions and component list
• Axle-offset measurement worksheet

WARNING: This product can expose you to chemicals including Arsenic, Cadmium, Chromium (Hexavalent compounds), Lead, Nickel, Cobalt and Antimony Trioxide which are known to the State of California to cause cancer or other reproductive harm. For more information go to www.p65warnings.ca.gov.

For fitment help, contact PMB Performance with your VIN and details of any axle, spindle or brake changes. Our team has over 20 years of experience checking parts and fitment, including the dimensions that a model-year search cannot establish.

Vehicle Applications

Application Notes

1. Line kit included (manufacturer): None