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Auto Barn
Est. 1957
Wilwood

Wilwood ST FSL4R Caliper 1.88/1.75 1.25 Rotor

$468.61

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Wilwood ST FSL4R Caliper 1.88/1.75 1.25 Rotor. This caliper uses Thermlock pistons to reduce heat transfer for improved braking performance.

Key Features

  • Fits various performance applications including dirt and asphalt ovals, off-road, rally, and road course.
  • Features differential bore pistons (1.88-inch and 1.75-inch) to reduce pad taper wear.
  • ST models include Thermlock® pistons that block heat transfer, reducing caliper and fluid temperatures by up to 25%.
  • Wear-resistant Type III hard anodize finish for durability.
  • Designed for sustained hard braking applications.
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About this part

Product Details

This is the Wilwood ST FSL4R caliper, designed for serious braking performance. It features differential bore pistons, meaning the pistons are different sizes (1.88-inch and 1.75-inch) to help manage pad wear and temperature across the pad surface. This is especially helpful during sustained hard braking, like on a race track or during aggressive off-road driving.

What sets the ST model apart are the Thermlock® pistons. These are built to block heat transfer from the brake pads, keeping the caliper, brake fluid, and seals cooler by up to 25% compared to standard stainless steel pistons. This improved heat management means more consistent braking power when you need it most. The caliper also has a tough Type III hard anodize finish, which holds up well against wear and tear in demanding conditions, making it a popular choice for oval track racing, rally, and road course applications.

Specifications

Brand
Wilwood
Manufacturer Part #
120-13263
UPC
889545085754

Frequently Asked Questions

Wilwood ST FSL4R Caliper 1.88/1.75 1.25 Rotor

$468.61