Wilwood Rear Drilled/Slotted 12.88-inch Rotor Package - Red FNSL4R for 1958–1964 Oldsmobile / Pontiac Housing Ends, 2.81-inch Offset

This red-caliper rear package is selected by Oldsmobile/Pontiac housing-end geometry, not by a generic GM vehicle label. The 12.88-inch SRP rotors and internal parking assemblies mount using the specified 2.81-inch-offset arrangement, including compatible custom axles. Wilwood Engineering was founded in 1977 by Bill Wood and is based in Camarillo, California. It designs and manufactures disc brake systems and components for motorsport, street-performance and specialized applications, with calipers, brake rotors, master cylinders, valves, fittings and brake lines in its range. Select individual components to meet the requirements of the complete brake system.

Technical Details

Kit contents and separate parts

• Manufacturer part number: 140-9224-DR
• Supply: one kit with brake components for both sides of the rear axle
• Mounting hardware: included
• Hubs: not included
• Spindles, master cylinder and brake booster: not included
• Hydraulic hoses: not included
• Required axle housing end: Olds/Pontiac
• Axle offset: 2.81 in; 71.37 mm
• The supplied internal-shoe parking brake operates independently of the four-piston service calipers.

Calipers and friction components

• Calipers: Forged Narrow Superlite 4R; 4 pistons per caliper
• Caliper finish: Red Powder Coat
• Body construction: Forged aluminum
• Piston material: stainless
• Caliper mounting: radial
• Hydraulic inlet: 1/8-27 NPT
• Included pad compound: BP-10
• Listed piston bore sizes: 1.12 / 1.12 in

Rotors and mounting dimensions

• Rotors: 12.88 in; 327.15 mm diameter x 1.10 in; 27.94 mm thick; vented Spec-37 Iron
• Friction faces: SRP Drilled & Slotted
• Rotor finish: Black Electro Coat
• Internal vanes: 48 curved
• Hats: aluminum; Black E-Coat; 1.950-inch hat offset
• Rotor/hat wheel-stud clearance patterns: 5 x 4.5 in; 5 x 114.3 mm; 5 x 4.75 in; 5 x 120.65 mm; 5 x 5 in; 5 x 127 mm
• Hat wheel-stud clearance holes: 0.520 / 0.520 / 0.520 in, corresponding to the listed hat patterns

Fitment & Compatibility

Selection is determined by the 1958–1964 Oldsmobile/Pontiac housing-end pattern and a measured 2.81-inch axle offset, including modified vehicles fitted with those ends. The vehicle entries in the table below do not establish stock rear-axle compatibility: a Ridetech front-spindle description does not identify the rear housing end. Verify flange, bearing, register and shock clearance using DS-534 and the axle-offset worksheet. Parking cables and hydraulic lines are purchased separately; universal cable kit 330-9371 is an application-dependent option. Nominal minimum wheel diameter: 17 in; 431.8 mm. Compare the actual wheel barrel and spokes with the linked clearance drawing; diameter alone does not establish fit.

Installation documents

• Installation instructions
• Technical bulletin

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.

PMB Performance offers parts-selection support backed by more than 20 years in brake systems and restoration. Let us help review the details of your vehicle and installation.

Vehicle Applications

Application Notes

1. Universal Flexline kits available: 220-7056 (14"), 220-7699 (16") or 220-8307 (18"). Choose correct length for your application.
2. Universal Parking Brake cable kit, may require modifications to cable or vehicle to install.
3. Line kit included (manufacturer): None