Wilwood Rear Red AERO4 GT Conversion with EPB — 14-Inch Big Ford New Style Brakes, 2.50-Inch Offset

The red AERO4 GT package combines 14-inch rear rotors with electrically actuated parking brakes for a compatible Big Ford New Style axle. Its larger rotor envelope requires a careful wheel-template check alongside the specified 2.50-inch axle-offset measurement. Calipers, brake rotors, master cylinders, valves, fittings and brake lines are all part of Wilwood Engineering’s range of disc brake systems and components. The Camarillo, California company was founded in 1977 by Bill Wood and designs and manufactures these products for motorsport, street-performance and specialized applications. Compatibility with the complete brake system determines the appropriate component choice.

Technical Details

• Manufacturer part number: 140-18153-R
• Rotor specification: Spec-37 Iron, GT Slotted, vented; 14.00 x 1.10 inches
• Caliper specification: 4-piston AERO4 in Red 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.

The table below provides the full application breakdown; match its year, model and brake-configuration details.

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.

Ask PMB Performance to help confirm the configuration before ordering if the vehicle has modified brakes or running gear. We have over 20 years of experience with parts and fitment; a VIN plus the installed component details gives us the best starting point.

Vehicle Applications

Application Notes

1. Line kit included (manufacturer): None