Wilwood Rear Dynapro Low-Profile Parking Brake Kit for Ford/Mercury Falcon/Ranchero/Comet/Mustang (1963–1966), Black Four-Lug 7.25-Inch Rear Axle

This Wilwood rear package combines black low-profile Dynapro calipers with 11-inch plain-face rotors and internal parking shoes. It is for the specified Ford 7.25-inch Mustang-style four-lug housing end and 2.80-inch axle offset. The listed Falcon, Ranchero, Comet and Mustang applications need that actual rear arrangement; six-cylinder front spindle information does not substitute for checking the axle end. 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
• Type: Forged Dynapro Low-Profile Rear Parking Brake Kit
• Calipers: Forged Dynapro Low Profile; 4 pistons per caliper; Black 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

DS932 and the current manufacturer page identify the 7.25-inch rear end, which should be confirmed by flange and bearing/register measurements. Check the four-on-four-and-a-half-inch wheel pattern and rotor alignment. Some 14-inch wheels may fit, but the full barrel and spoke diagram is required. Hydraulic lines and parking-cable hardware are separate, with cable travel and system balance assessed for the completed vehicle.

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.