Wilwood Front FNSL6R Brake Upgrade for GM A/F/X-Body and Ridetech Pin Spindles (1960–1982 Applications), Polished - GT Slotted Rotors, 12.88-inch Diameter

This polished-caliper front kit uses GT slotted 12.88-inch rotor rings and aluminum hats. Supplied bearings and dual-pattern hubs fit the documented spindle configurations, including the specifically listed Ridetech conversions. Bill Wood established Wilwood Engineering in 1977. Based in Camarillo, California, the company designs and manufactures disc brake systems, calipers, brake rotors, master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized applications. Individual parts must match the complete brake system and its operating requirements.

This 12.88-inch kit pairs polished calipers with GT slotted rotors. You get the polished look with a rotor face that holds up to track heat, in a size meant for wheels that won't clear the 14-inch kits. Clean the calipers with a pH-neutral wheel cleaner to keep the shine. The drilled-and-slotted version with polished calipers is 140-9803-DP.

Technical Details

Calipers and friction components

• Calipers: Forged Narrow Superlite 6R; 6 pistons per caliper
• Caliper finish: Polished
• 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: GT 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-P
• 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.

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 has supported brake and restoration projects for more than 20 years. Share the vehicle and installed hardware with us for help selecting a compatible package.

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