Wilwood Front Drilled/Slotted 12.88-inch Rotor Package - Red FNSL6R for GM A/F/X-Body and Ridetech Pin Spindles (1960–1982 Applications)

Red Superlite calipers and drilled/slotted rotors equip this front brake-and-hub conversion. Its replacement hubs increase track width by the amounts specified for OE drum and disc applications, so the correct spindle and available fender space must both be checked. Wilwood Engineering designs and manufactures disc brake systems and components, including calipers, brake rotors, master cylinders, valves, fittings and brake lines. Bill Wood founded the company in 1977; its Camarillo, California operation serves motorsport, street-performance and specialized applications. The requirements of the complete brake system govern the choice of individual components.

Red calipers and 12.88-inch SRP drilled-and-slotted rotors are the combination here, a good match for a street car with smaller wheels than the 14-inch 140-9804 kits need. Check your wheel against the clearance drawing first. For regular track days, 140-9803-R keeps the red calipers and uses GT slotted rotors, which resist heat cracking better than drilled faces.

Technical Details

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; 1.750-inch hat offset
• Supplied hub wheel-stud patterns: 5 x 4.5 in; 5 x 114.3 mm; 5 x 4.75 in; 5 x 120.65 mm
• Wheel studs: 1/2-20 thread; supplied with the hubs

Kit contents and separate parts

• Manufacturer part number: 140-9803-DR
• Supply: one kit with brake components for both sides of the front axle
• Mounting hardware: included
• Hubs: included with bearings and seals
• Spindles, master cylinder and brake booster: not included
• Hydraulic hoses: not included
• Dual-pattern aluminum hubs with bearings, seals and 1/2-20 wheel studs are included.

Calipers and friction components

• Calipers: Forged Narrow Superlite 6R; 6 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: 1.62 / 1.12 / 1.12 in

Fitment & Compatibility

The table below separates original GM disc/drum spindles from vehicles fitted with the specified Ridetech pin spindles. It includes GM applications such as Camaro, Chevelle, Nova, Cutlass, Skylark, Firebird and GTO, plus specifically modified Falcon, Mustang, F-100, Comet and Corvette applications. Do not treat the latter as stock-spindle fitments. DS-564 requires drilling/tapping on some early spindles and recommends a qualified machinist. Track width increases 0.38 inch per side from the OE drum face or 0.09 inch from the OE disc face. Check fender and wheel clearance, and select separate hoses for the actual suspension. 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

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.

With over 20 years of brake-system and restoration experience, PMB Performance can help you review the application, wheel clearance and remaining parts for the 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. This is a front service-brake kit. Select any rear parking-brake cable separately for the vehicle's actual rear brake system.
3. Line kit included (manufacturer): None
4. Front line-kit reference: 220-7056