Wilwood Front 12.88-inch Rotor and FNSL6R Kit - Red, GT Slotted, Mustang II (1974–1978), Pinto (1974–1980) and Bobcat (1975–1980), OE Disc Spindles

This red-caliper kit pairs 12.88-inch GT slotted rings with aluminum rotor hats and new wheel hubs. It is a front service-brake conversion for the stated Mustang II/Pinto/Bobcat disc spindles, with hydraulic lines selected to suit the vehicle. 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.

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: GT Slotted
• Rotor finish: Black Electro Coat
• Internal vanes: 48 curved
• Hats: aluminum; Black E-Coat; 1.880-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: 140-9801-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
• Supplied hubs offer 5 x 4.50 and 5 x 4.75-inch stud patterns with 1/2-20 wheel studs.

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

Fits only the original disc-brake spindles on the Mustang II, Pinto and Bobcat years listed in the table below. Confirm the actual spindle if the vehicle has been modified; a drum-brake spindle is not interchangeable for this kit. Aluminum hubs, wheel bearings, seals and studs accompany the brake components. Choose the hub bolt pattern to match the wheels and verify DS-562 clearance. Hoses are separate; universal 14-, 16- and 18-inch options are 220-7056, 220-7699 and 220-8307, with length selected for steering and suspension travel. 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. Kit fits 74-80 Pinto / Mustang II original disc brake spindles only.
2. Universal Flexline kits available: 220-7056 (14"), 220-7699 (16") or 220-8307 (18"). Choose correct length for your application.
3. If a separate replacement master cylinder is installed, its pushrod may require modification. No master cylinder is included in this front brake kit.
4. This is a front service-brake kit. Select any rear parking-brake cable separately for the vehicle's actual rear brake system.
5. Line kit included (manufacturer): None
6. Front line-kit reference: 220-8307