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Product details
The left FSLI4-ST uses Thermlock pistons in a differential four-piston forged housing. A nominal 1.25-inch rotor-width channel and 1.88/1.75-inch bore combination define this 5.18-square-inch configuration. For motorsport, street-performance and specialized braking applications, Wilwood Engineering designs and manufactures calipers, brake rotors, master cylinders, valves, fittings and brake lines. The disc brake company was founded by Bill Wood in 1977 and is based in Camarillo, California.
Technical Details
- Manufacturer part number: 120-11332. Component: Forged Superlite Internal 4 ST caliper.
- Supply: one brake caliper, not a complete axle brake kit. Match the mating rotor, pads, bracket and connection hardware to the installation.
- Bore configuration 1.88/1.75 inches across 4 pistons; piston material: Thermlock. Hydraulic effective area: 5.18 square inches.
- Construction and surface: forged aluminum housing finished in Type III anodize.
- Bracket interface: 3.50-inch lug centers with 0.45-inch holes. Specified mount height: 2.85 inches; orientation: left hand.
- Caliper weight: approximately 5.2 lb.
- Nominal rotor width 1.25 inch; compatible outside diameter from 11.75 through 13.06 inches. Specified rotor-width limits: 1.19–1.38 inch.
- Piston dust boots: not fitted.
- Pad fit is type 7420. Match the pad dimensions and compound to the rotor and intended braking conditions.
- Hydraulic inlet thread: 1/8-27 NPT. Use a fitting with the correct thread and sealing seat.
Fitment & Compatibility
Check the left-hand body against the bracket and rotor before fitting. The ST piston construction should be identified explicitly when replacing a standard FSLI4 that shares its external mounting format.
PMB Performance has worked with brake components for over 20 years. Share the required piston sizing, rotor measurements and bracket drawing for help checking the match.
