Fitment questions?
Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.
Product details
The red FNSL6R/GT combination supplies the Roadster Shop front axle with six-piston calipers and slotted Spec-37 rotors. The 12.88-inch discs use separate hats, so hubs and spindles remain part of the existing compatible chassis rather than this brake package. Founded by Bill Wood in 1977 and based in Camarillo, California, Wilwood Engineering designs and manufactures disc brake systems for motorsport, street-performance and specialized applications. Its components include calipers, brake rotors, master cylinders, valves, fittings and brake lines, selected to suit the complete brake system.
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 coating/finish: Black Electro Coat
- Internal vanes: 48 curved
- Hats: Aluminum; Black E-Coat; 1.500-inch hat offset
- Rotor/hat wheel-stud clearance patterns: 5 X 4.5 in; 5 X 114.3 mm; 5 X 4.75 in; 5 X 120.65 mm
Calipers and pads
- Calipers: FNSL6R; 6 pistons
- Caliper finish: Red Powder Coat
- Body construction: Forged aluminum
- Pistons: stainless
- 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: 140-18366-R
- Supply: one brake kit; components for both sides of the axle
- Mounting hardware: included
- Hubs: not included
- Spindles, master cylinder and brake booster: not included
- Brake flexlines: not included
Fitment & Compatibility
The Superlite front brackets are made for the Roadster Shop Mustang II spindle/upright with the specified five-on-4.75-inch hub. Check that hardware first, then compare the 12.88-inch rotor and radial caliper envelope with the wheels. This application depends on the Roadster Shop components rather than an original Mustang model year. Follow the guide's steering-arm bracket orientation, rotor registration and shim procedure. Compatible hubs stay on the vehicle, and neither replacement hubs nor spindles are included. Hydraulic flexlines must be selected separately for the installed suspension. Nominal minimum wheel diameter: 17 in; 431.8 mm. The linked wheel-clearance diagram must confirm barrel and spoke clearance; wheel diameter alone does not guarantee fit.
Installation documents
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 brings more than 20 years of brake and restoration experience to parts selection. Contact us with the installed spindle or axle details if you need help matching this kit.
