Wilwood FSL4R Left Four-Piston Brake Caliper, 1.25-Inch Rotor Width / Differential Stainless: Gray radial-mount Superlite with white lettering and piston-count marking, central bridge bolt and open pad channel.

Wilwood FSL4R Left Four-Piston Brake Caliper, 1.25-Inch Rotor Width / Differential Stainless

SKU: 120-13230

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Fitment questions?

Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.

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Product details

Wilwood pairs 1.88- and 1.62-inch stainless pistons in this left-hand Forged Superlite 4R. The four-piston caliper is Type III anodized and accepts the larger 7420 pad format in a radially attached body. 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: 120-13230. Component: Forged Superlite 4 Radial Mount caliper.
  • Supply: one brake caliper, not a complete axle brake kit. Match the mating rotor, pads, bracket and connection hardware to the installation.
  • Piston dust boots: not fitted.
  • Bore configuration 1.88/1.62 inches across 4 pistons; piston material: stainless steel. Hydraulic effective area: 4.84 square inches.
  • Nominal rotor width 1.25 inch; compatible outside diameter from 11.75 through 14.00 inches. Specified rotor-width limits: 1.15–1.35 inch.
  • Pad fit is type 7420. Match the pad dimensions and compound to the rotor and intended braking conditions.
  • Bracket interface: 5.98-inch radial centers with 0.39-inch holes. Specified mount height: 1.63 inches; orientation: left hand.
  • Caliper weight: approximately 5.3 lb.
  • Construction and surface: forged aluminum housing finished in Type III anodize.
  • Hydraulic inlet thread: 1/8-27 NPT. Use a fitting with the correct thread and sealing seat.

Fitment & Compatibility

Match the left-side caliper position and the rotor’s usable friction annulus. The permitted rotor width is 1.15–1.35 inches, and the 5.98-inch radial attachment must place the body at the correct height without contacting the hat or wheel.

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.