Eagle Speed S-04 Radial 4-Piston Front Brake Caliper

Upgrade your motorcycle or electric motorcycle's stopping power with the Eagle Speed S-04 Large Radial Front Brake Caliper. Engineered to track-level standards, this CNC-forged aluminum caliper delivers consistent, progressive braking performance whether you're carving mountain bends, commuting daily, or pushing hard on the track. Made in Mainland China.

Key Features

1. Forged Radial Heat-Dissipation Design

Integrated CNC-forged aluminum construction features a large radial hollow heat-dissipation groove that channels airflow to rapidly draw brake heat away from the caliper. During sustained mountain descents or intense commuting, thermal fade is effectively suppressed, keeping braking performance consistent lap after lap.

2. Symmetrical 4-Piston Opposed Braking

Four opposed pistons apply even, balanced pressure across the brake pads for a smooth, linear brake feel. Front-end dive is minimized, rear braking force is abundant, and progressive lever input keeps wheel lock-up at bay — even on wet or slippery surfaces. Ideal for everyday commuting and spirited cornering alike.

3. Gold Exclusive Anti-Counterfeit Fastening Screws

Every caliper ships with brand-exclusive gold-anodized fastening screws. These high-recognition screws reinforce cylinder body locking, resist loosening and oil seepage, and serve as a built-in anti-counterfeit marker — enhancing both durability and the overall aesthetic of your modified motorcycle.

4. High-Temperature Sintered Brake Pads Included

Factory-fitted sintered brake pads withstand extreme temperatures and water immersion. They wear slowly during rainy-day or high-frequency braking, generate minimal brake dust, and outlast conventional semi-metallic pads significantly — reducing the frequency and cost of pad replacement.

5. DOT-Resistant Oil Seals — Long-Term Leak-Free Performance

Full-specification DOT-resistant brake fluid seals keep out dust, water vapor, and sediment. Engineered to resist aging under prolonged high and low temperature cycling, these seals eliminate the common caliper oil-leak and air-ingress issues that plague budget calipers, keeping maintenance simple and worry-free.

6. Universal Radial Mounting — Fits Mainstream Electric Motorcycles

Standard large radial mounting hole spacing allows direct front-wheel installation via a dedicated adapter bracket. The universal oil-line interface is compatible with most stock brake lines — no hydraulic circuit modifications required.

Specifications

Material: CNC-Forged Aluminum Alloy
Piston Configuration: 4-Piston Opposed Symmetrical
Brake Pad Type: High-Temperature Sintered (included)
Seal Type: DOT-Resistant Full-Spec Oil Seals
Mounting: Large Radial, Universal Interface
Model: JK26 / S-04
Origin: Made in Mainland China

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For authoritative guidance on motorcycle safety equipment standards, refer to the U.S. Consumer Product Safety Commission (CPSC).

Learn more: Disc brake

Frequently Asked Questions

Q: What motorcycles and electric motorcycles is the Eagle Speed S-04 front brake caliper compatible with?

A: The S-04 uses a standard large radial mounting hole pattern compatible with the majority of mainstream electric motorcycles and many conventional motorcycles. A dedicated adapter bracket is used for direct front-wheel installation, and the universal oil-line interface fits most OEM brake lines without requiring any hydraulic modifications.

Q: Do the sintered brake pads included with the S-04 caliper work well in wet conditions?

A: Yes. The factory-fitted high-temperature sintered brake pads are specifically formulated to resist water immersion and maintain strong, consistent braking performance in wet or rainy conditions. They also wear significantly slower than standard semi-metallic pads during frequent braking events, extending service intervals.

Q: How does the radial heat-dissipation groove design benefit braking performance?

A: The CNC-machined radial hollow grooves create large air ducts around the caliper body. As you ride, airflow passes through these channels and rapidly draws heat away from the braking surfaces. This suppresses thermal fade during sustained or repeated hard braking — such as long mountain descents or track sessions — keeping stopping power consistent throughout.

Q: Is any special brake fluid required for the S-04 caliper?

A: The S-04 uses full-specification DOT-resistant oil seals, making it compatible with standard DOT brake fluids. Always use the brake fluid type recommended for your specific motorcycle's hydraulic system and follow your manufacturer's fluid change intervals.