What is the benefit of differential bore pistons?

Differential bore pistons, with bores of 1.88 inches and 1.75 inches in these calipers, help to compensate for uneven mechanical loading and temperature differences across the brake pad. This reduces taper wear, leading to more consistent pad performance and longer pad life.

How do Thermlock® pistons improve braking performance?

Thermlock® pistons are designed to block heat transfer from the brake pads into the caliper body. This can reduce temperatures in the caliper, brake fluid, and seals by up to 25% over standard stainless steel pistons, helping to prevent brake fade during sustained hard braking.

What brake disc thickness are these calipers designed for?

These Wilwood Superlite 4-ST calipers are specifically designed to work with brake discs that are 1.25 inches thick.

Wilwood Superlite 4-ST Brake Caliper 1.88/1.75in Pistons 120

Name: Wilwood Caliper-Forged Superlite 4-ST 1.88/1.75in Pistons 1.25in Disc
Brand: Wilwood
SKU: wilwood-wilwood-caliper-forged-superlite-4-st-1-88-1-75in-pistons-1-25in-disc-t14-138984
Price: 442.13 USD
Availability: BackOrder

Wilwood Caliper-Forged Superlite 4-ST 1.88/1.75in Pistons 1.25in Disc

$442.13

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Wilwood Superlite 4-ST forged brake caliper with differential bore pistons and Thermlock technology for improved heat management.

Key Features

Forged aluminum caliper body for strength.
Differential bore pistons (1.88in and 1.75in) reduce pad taper wear.
Thermlock® pistons block heat transfer, reducing caliper and fluid temperatures by up to 25%.
Designed for 1.25-inch thick brake discs.
Ideal for sustained hard braking in racing and off-road applications.

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Product Details

The Thermlock® pistons in Wilwood's Superlite 4-ST calipers are a notable design choice, blocking heat transfer from the brake pads and reducing caliper temperatures by up to 25% compared to standard stainless steel pistons. This advanced heat management is crucial for sustained hard braking, making these calipers a popular choice for demanding applications like dirt and asphalt oval racing, off-road use, rally, and road courses. The calipers also feature differential bore pistons, with one bore measuring 1.88 inches and the other 1.75 inches. This design helps to compensate for uneven pad loading and temperature variations across the pad surface, which in turn reduces taper wear and extends pad life, especially under high-temperature conditions.

Forged from strong aluminum, these calipers are built to handle the rigors of performance driving. The combination of differential bore pistons and Thermlock® technology means you get more consistent braking performance and longer component life, even when pushing your vehicle hard. They are designed to work with 1.25-inch thick discs, offering a solid option for those looking to upgrade their braking system for more aggressive use.