Wilwood Rear Dynalite Internal Conversion with 12.19-Inch Drilled/Slotted Rotors and Red Calipers, 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. Red calipers and 12.19-inch SRP drilled & slotted rotors are the selected configuration. The axle interface is the BOP 2.75-inch bearing flange with a 2.75-inch axle offset. Bill Wood founded Wilwood Engineering in 1977; the company is based in Camarillo, California. Wilwood designs and manufactures calipers, brake rotors, master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized systems, with selection governed by the complete brake installation.

Technical Details

• Kit supplied under manufacturer part number 140-16989-DR; one listed axle/application assembly.
• Each service caliper uses 4 stainless pistons and the Forged Dynalite Internal body design. It attaches through lug mounts and carries a red powder coat finish.
• Verify the existing hub dimensions: replacement wheel hubs are outside the scope of this package.
• A 15-inch nominal wheel is the starting point. Its spoke and barrel shape must clear the actual brake assembly.
• Drum parking-brake assemblies are included inside the rotor hats. Supply parking cables, cable hardware/adapters and hydraulic hoses/fittings separately.
• The rotor friction surfaces are SRP drilled & slotted. The assembly diameter is 12.19 inches; rotor width is 0.81 inch and material is Iron.
• An axle pad set in BP-10 compound accompanies the calipers, whose published bores are 1.38, 1.38 inches.
• The specified caliper hydraulic connection is 1/8-27 NPT.
• This package excludes flexible brake hoses. Select the documented caliper and chassis-end connections separately.
• Mounting hardware and brake pads come with the kit. Spindles, a master cylinder and a brake booster are not 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.

With over 20 years of parts and application experience, PMB Performance can help compare this assembly with your existing brakes. Supply the hub, axle or spindle specification and wheel-clearance information before ordering.

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.