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Product details
For a brake assembly requiring the 1.25-inch rotor-width version, this Wilwood FNSL6R-ST left brake caliper provides the anodized configuration. Compare its radial mount and piston area with the component being replaced. The Wilwood disc brake range is designed and manufactured for motorsport, street-performance and specialized applications. It includes brake lines, fittings, valves and master cylinders together with calipers and brake rotors. Wilwood Engineering was founded in 1977 by Bill Wood and is based in Camarillo, California; its components must be matched to the complete braking system. The Forged Narrow Superlite 6R-ST uses radial mounting and six Thermlock insulated pistons. Radial mounting permits bracket adjustment but still requires accurate rotor centering, mounting height and pad sweep. Check the differential bores when matching an existing brake system.
Technical Details
- Manufacturer part number: 120-15989
- Component: Forged Narrow Superlite 6 Radial Mount; one individual caliper
- Placement: Left
- Construction and finish: Forged aluminum; Type III Anodize
- Pistons: 6; Thermlock insulated; bore dimensions 1.62/1.12/1.12 inches
- Hydraulic piston area: 4.04 square inches
- Dust boots: No
- Brake pad shape: 7416; shape number does not specify a friction compound
- Nominal rotor width: 1.25 inches
- Rotor width range: 1.19–1.25 inches
- Rotor diameter range: 11.75–14.00 inches
- Caliper weight reference: 5.0 lb
- Mounting interface: Radial; mounting centers 5.98 inches
- Mounting-hole diameter: 0.39 inches
- Mount height: 1.45 inches
- Hydraulic inlet thread: 1/8-27 NPT
Fitment & Compatibility
Check bracket location and rotor sweep using the installation drawing; 5.98-inch radial mounting alone does not establish a vehicle fit. Use the left-hand caliper and keep the bleed arrangement in the specified orientation. Use the 1.62/1.12/1.12-inch piston-bore specification when reviewing hydraulic balance, and verify hose routing and wheel clearance.
Wilwood caliper specifications · Wilwood technical reference
PMB Performance brings over 20 years of parts and fitment experience to brake component selection. A photograph of the existing brake and its mounting measurements helps us check the required configuration.
