Wilwood Rear Brake Conversion, Black Dynalite Internal / Plain 12.19-Inch Package for BOP 2.75-Inch Bearing Axles

This staggered rear brake conversion combines four-piston Dynalite Internal service calipers with 12.19-inch rotors and internal drum parking-brake assemblies. The axle interface is the BOP 2.75-inch bearing flange with a 2.75-inch axle offset. Black calipers and 12.19-inch plain face rotors are the selected configuration. Founded by Bill Wood in 1977 and based in Camarillo, California, Wilwood Engineering designs and manufactures disc brake systems and components for motorsport, street-performance and specialized applications. Its range includes calipers, brake rotors, master cylinders, valves, fittings and brake lines, chosen to match the complete system.

Technical Details

• The Wilwood manufacturer part number is 140-16989. This product is sold as a kit.
• The black powder coat caliper bodies are Forged Dynalite Internal units with 4 pistons. Stainless pistons and lug mounts are specified.
• 12.19-inch rotors are supplied in the plain face configuration; the published thickness is 0.81 inch. These rotors use Iron.
• Friction material supplied is BP-10; the caliper bore measurements are 1.38, 1.38 inches.
• The original hub arrangement must be retained or provided separately. No replacement wheel hubs come with the kit.
• Caliper inlet thread is 1/8-27 NPT.
• Published minimum rim diameter is 15 inches. Use the template to check spoke clearance as well.
• Provide suitable flexible hoses and caliper/chassis fittings; the brake kit does not supply flexlines.
• Drum parking-brake assemblies are included inside the rotor hats. Supply parking cables, cable hardware/adapters and hydraulic hoses/fittings separately.
• Supplied items include the pads and mounting fasteners; no replacement spindle, master cylinder or booster is included.

Fitment & Compatibility

Measure the rear axle before choosing the Dynalite package: the required BOP bearing flange is 2.75 inches, axle offset is 2.75 inches, and the bracket set is staggered for the corresponding shock arrangement. DS-1530 identifies the 1964–1970 Buick/Oldsmobile/Pontiac axle family without establishing a particular model here. The axle flange may be no larger than 6.61 inches with the documented chamfer. Check rotor register and 1/2-inch stud holes; smaller factory studs may need a machine-shop conversion. Cables, cable fittings/adapters and hydraulic hoses/fittings are separate purchases.

PMB Performance brings 20+ years of parts and fitment experience to brake selection. Send the actual hub or spindle details, existing brake configuration and wheel measurements for help checking this combination.

Manufacturer documentation: Installation instructions; Technical bulletin.

Manufacturer Warning

Applicable to brake pads only: Wilwood warns of exposure to arsenic, cadmium, hexavalent chromium compounds, lead, nickel, cobalt and antimony trioxide, chemicals known to California to cause cancer or reproductive harm. More information:

P65Warnings.ca.gov.