Wilwood Big Ford New Style Dual-XRD Rear Drag Brake Conversion, 2.50-Inch Offset and Drilled Lug-Drive Rotors

Dual XRD calipers per rear wheel pair with drilled Super Alloy rotors for a measured Big Ford New Style axle. Confirm offset and hydraulic layout. The wheel-end assembly is selected by its measured housing-end interface and racing hydraulic arrangement. From Camarillo, California, Wilwood Engineering designs and manufactures disc brake systems for motorsport, street-performance and specialized applications. Founded in 1977 by Bill Wood, the company produces calipers, brake rotors, master cylinders, valves, fittings and brake lines. Component selection depends on the requirements of the complete braking system.

Technical Details

• Rotor / hat axle-flange drilling: 5 X 4.50; 5 X 4.75; 5 X 5.00 inches; this does not change the retained hub or axle wheel pattern
• Hydraulic flexlines: Not included; supply suitable hoses and fittings separately
• Mounting hardware: Included; verify the installed fastener engagement
• Not included: spindles, wheel hubs, master cylinder or brake booster
• Manufacturer part number: 140-17874-D
• Brake assembly: rear conversion kit; Sold as a kit.
• Calipers: Forged XRD Lug Mount; 4 pistons per caliper; Type III Anodize
• Caliper mounting: Lug
• Included pad compound: BP-28
• Piston material: Stainless
• Hydraulic caliper inlet: 1/8-27 NPT
• Rotor dimensions and construction: 11.25 × 0.35 inches; Super Alloy; Drilled
• Wheel-size reference: 15 in; the complete wheel-clearance drawing determines fit
• Axle mounting interface: Big Ford New Style; measured axle offset 2.50 in

Fitment & Compatibility

The dual-caliper configuration has two XRD units at each rear wheel and requires a Big Ford New Style housing end with 2.50-inch measured axle offset. Confirm the hydraulic circuits and clearance for both calipers before selecting it. The 11.25-inch Super Alloy rotors engage dynamic lug-drive hats and are retained with internal snap rings; the axle wheel pattern is unchanged by the hat drilling. Match the bearing retainer, axle registration and wheel drawing in DS-1607 and supply the hydraulic hoses separately. The 1990 Lincoln Town Car row below requires verification of the actual rear axle; its model name alone is insufficient.

Wilwood product specifications · Wilwood installation and compatibility information · Axle measurement worksheet · Wilwood installation and compatibility information

Before purchase, send PMB Performance the actual housing flange, axle offset, rotor registration and parking or hydraulic arrangement. Our over 20 years of parts and fitment experience helps identify the installation details that need to be checked.

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