Wilwood Front Black Brake Assembly for GM A/F/X-Body and Ridetech Pin Spindles (1960–1982 Applications) - FNSL6R and 12.88-inch Drilled/Slotted Rotors

This black-caliper 12.88-inch package uses SRP rotors with aluminum hats and replacement hubs. Its broad vehicle coverage depends on the exact listed spindle, including required Ridetech conversions and machining on some early GM applications. 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. Component selection must account for the requirements of the complete brake system.

Black calipers and SRP drilled-and-slotted 12.88-inch rotors make up this kit. Choose the 12.88-inch size when your wheels are too small for the 14-inch 140-9804 series, and confirm with the clearance drawing. Drilled rotors are mostly a street-car choice. For regular track use, the GT slotted 140-9803 holds up better, because drilled holes can crack under sustained heat.

Technical Details

Kit contents and separate parts

• Manufacturer part number: 140-9803-D
• 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: Black 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

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

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.

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. 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