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

Red FNSL6R calipers work with slotted Spec-37 rotors in this 12.88-inch front hub package. The hub, bearing and bracket arrangement is selected by the installed spindle, not simply by the make and year of a modified vehicle. From its base in Camarillo, California, Wilwood Engineering designs and manufactures disc brake systems for motorsport, street-performance and specialized applications. Founded in 1977 by Bill Wood, its range covers calipers, brake rotors, master cylinders, valves, fittings and brake lines. Select the individual parts around the requirements of the entire braking system.

Red calipers and GT slotted rotors in the 12.88-inch size suit a car that runs smaller wheels and still sees hard use. Slotted-only rotors handle repeated track heat better than drilled ones. If your wheels can clear 14-inch rotors, the 140-9804-R kit is the same idea with a larger rotor. Red calipers with drilled-and-slotted 12.88-inch rotors are 140-9803-DR.

Technical Details

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

Kit contents and separate parts

• Manufacturer part number: 140-9803-R
• 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.

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

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.

Our team at PMB Performance draws on 20+ years of brake and restoration work. We can help check the mounting requirements and component choices for your build.

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