Wilwood Dual XRD Rear Drag Brakes for Oldsmobile/Pontiac Axle Ends, 11/16-Inch Studs, 2.81-Inch Offset and Lug-Drive Rotors

Arrange dual rear drag calipers on the specified Oldsmobile/Pontiac flange. This large-stud XRD kit requires an 11/16-inch stud and offset check. The wheel-end assembly is selected by its measured housing-end interface and racing hydraulic arrangement. Camarillo, California, is home to Wilwood Engineering, the disc-brake manufacturer Bill Wood founded in 1977. Wilwood designs and manufactures systems and components including master cylinders, calipers, rotors, valves, fittings and brake lines. Those parts serve motorsport, street-performance and specialized uses and must be selected as part of the complete brake system.

Technical Details

• Rotor hat bolt-circle specification: 5 x 5.00; 5 x 4.75 inches; this does not change the retained hub or axle wheel pattern
• Axle stud requirement: 11/16-inch diameter, as specified in the exact installation instructions
• Hydraulic hose selection: Not included; supply suitable hoses and fittings separately
• Hardware provision: Included; verify the installed fastener engagement
• Not included: spindles, wheel hubs, master cylinder or brake booster
• Manufacturer identification: 140-17880-D
• Application and supplied quantity: rear conversion kit; Sold as a kit.
• Hydraulic service-caliper specification: Forged XRD Lug Mount; 4 pistons per caliper; Type III Anodize
• Caliper attachment: Lug
• Brake pads supplied: BP-28
• Piston type: Stainless
• Service-caliper port: 1/8-27 NPT
• Rotor assembly specification: 11.25 × 0.35 inches; Super Alloy; Drilled
• Wheel envelope: 15 in; the complete wheel-clearance drawing determines fit
• Rear housing interface: Olds/Pontiac; measured axle offset 2.81 in

Fitment & Compatibility

For the large-stud Oldsmobile/Pontiac drag-racing configuration, verify an 11/16-inch stud and 2.81-inch axle offset before purchase. The exact DS-1609 instructions specify that stud size for this dual-XRD selection. Each rear rotor has two four-piston calipers; plan their hydraulic circuits and compare both brackets with the housing end and wheel drawing. The drilled 11.25-inch Super Alloy rotor floats in a snap-ring-retained dynamic lug-drive hat, leaving the original axle wheel pattern unchanged. Hoses are separate. The Chevelle, 442, Beaumont, Camaro and Apollo table below remains conditional on a verified axle assembly.

Wilwood product specifications · Wilwood installation and compatibility information · Axle measurement worksheet · Wilwood installation and compatibility information

Before purchase, send PMB Performance the actual housing flange, axle offset, rotor registration and parking or hydraulic arrangement. Our over 20 years of parts and fitment experience helps identify the installation details that need to be checked.

Manufacturer warning — brake pads only: WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov.