Wilwood Red Four-Lug Rear Disc & Parking Brake Conversion, Ford/Mercury Falcon/Ranchero/Comet/Mustang (1963–1966), Ford 7.25-Inch Rear Axle

Red four-piston Dynapro Low Profile calipers and plain 11-inch rotors form this Wilwood rear conversion. The matched bracket and internal parking-shoe assembly fit the specified 7.25-inch Ford rear flange with 2.80-inch axle offset and four-lug wheels. Confirm the installed rear axle on the listed vehicle, particularly where driveline or suspension modifications have replaced original hardware. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. The company designs and manufactures disc brake systems and components, including calipers, brake rotors, master cylinders, valves, fittings, and brake lines for motorsport, street-performance, and specialized applications.

Technical Details

• Manufacturer part number: 140-12589-R
• Type: Forged Dynapro Low-Profile Rear Parking Brake Kit
• Calipers: Forged Dynapro Low Profile; 4 pistons per caliper; Red Powder Coat.
• Caliper bore sizes: 1.38, 1.38 inches. Piston type: Stainless.
• Included pad compound: BP-10.
• Rotors: 11.00-inch diameter × 0.81-inch thickness; Plain Face; Iron; Plain surface; 32 vanes.
• Rear housing end: 7.25 Mustang.
• Required axle flange offset: 2.80 inches.
• Bolt pattern: 4 x 4.5 in; 4 x 114.3 mm.
• Included: paired calipers, pads, rotors, mounting brackets and assembly hardware, internal parking-brake shoe assemblies.
• Hydraulic lines and fittings selected separately. No master cylinder, booster or spindles are supplied.
• Parking-brake cables, clevis hardware and adapters are separate.
• Conditional wheel screening size: 14 inches. Use the installation clearance diagram to verify the actual barrel and spoke profile.
• Axle-flange limit: 6.61-inch maximum diameter with the specified 0.050-inch × 45-degree chamfer. The drawing is for half-inch wheel studs and recommends upgrading smaller original studs; verify any larger-stud machining separately.

Fitment & Compatibility

Compare the actual housing flange, register and axle offset with DS932. The 7.25-inch designation is confirmed by the manufacturer; a different Ford rear end requires its own mounting package. Verify spoke and barrel clearance for any intended 14-inch wheel. Select hydraulic hoses, parking cables, clevises and adapters separately, then establish correct cable operation and front/rear brake balance with the vehicle's hydraulic system.

Match the individual model, year, submodel and brake configuration in the fitment table below.

Wilwood installation documents: Installation instructions; Technical bulletin.

PMB Performance has over 20 years of brake-system experience. Contact us with your vehicle details and installed brake hardware for help confirming the correct arrangement.

California Proposition 65 warning, brake pads only: 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.