Wilwood Olds/Pontiac Rear Lug-Drive Drag Brake Kit, 2.81-Inch Offset, Chevrolet/Oldsmobile/Pontiac/Buick Chevelle/442/Beaumont/Camaro/Apollo (1964–1974)

This Wilwood rear drag configuration uses the Oldsmobile/Pontiac housing flange and a measured 2.81-inch axle offset. One four-piston Dynapro caliper per wheel clamps an 11.44-inch drilled Super Alloy ring on a lug-drive hat. The listed vehicle models require confirmation against the installed rear axle; a front-spindle choice cannot establish this rear mounting geometry. 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: 140-12548-D
• Type: Dynapro SA Lug Drive Dynamic Rear Drag Brake Kit
• Calipers: Dynapro Lug Mount; 4 pistons per caliper; Type III Anodize.
• Caliper bore sizes: 1.75, 1.75 inches. Piston type: Stainless.
• Included pad compound: BP-28.
• Rotors: 11.44-inch diameter × 0.35-inch thickness; Drilled; Super Alloy; Plain surface; solid, unvented.
• Rear housing end: Olds/Pontiac.
• Required axle flange offset: 2.81 inches.
• Wheel bolt circles: 5 X 4.50; 5 X 4.75; 5 X 5.00 inches.
• Included: paired calipers, pads, rotors, mounting brackets and assembly hardware, rotor hats.
• Hydraulic lines and fittings selected separately. No master cylinder, booster or spindles are supplied.
• Conditional wheel screening size: 15 inches. Use the installation clearance diagram to verify the actual barrel and spoke profile.
• Wheel-stud selection: half-inch wheel studs as specified by the installation drawing; the selected hat has 0.520-inch clearance holes.
• Axle-flange limit: 6.29-inch maximum outside diameter with the specified 0.050-inch × 45-degree chamfer. Match the register and stud configuration to the exact installation drawing.

Fitment & Compatibility

Compare the actual flange and bearing register with DS910, including the wheel-stud pattern and axle offset. The kit is for the specified housing end, which may be installed on a different axle make in a modified race chassis. Confirm vehicle application and drag-use suitability before ordering. Plan hydraulic connections separately and check the complete wheel envelope rather than relying only on the 15-inch screening size.

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.