IIIPRO CNC 4-Piston Flat Mount Hydraulic Disc Brake Caliper

4-Piston Braking Power. CNC Precision. Lightweight Performance.

Upgrade your bike's braking system with the IIIPRO CNC 4-Piston Hydraulic Disc Brake Caliper, designed for riders looking for powerful braking, lightweight construction, and distinctive anodized finishes.

Featuring a one-piece CNC-machined aluminum alloy body and a dual-sided four-piston braking system, this caliper is designed to apply braking pressure from both sides of the rotor for controlled braking performance.

Weighing approximately 85g per caliper, excluding brake pads and mounting bolts, it offers a lightweight option for compatible road and gravel bike builds.

Key Features

4-Piston Hydraulic Braking System

Four pistons work in opposing pairs to apply braking force from both sides of the rotor.

• Dual-sided piston actuation

• Four-piston configuration

• Balanced pad pressure

• Designed for controlled, powerful braking

One-Piece CNC Aluminum Alloy Body

Precision CNC-machined aluminum alloy construction provides a compact, rigid caliper body.

• One-piece aluminum alloy design

• CNC-machined construction

• Lightweight structure

• Precision-machined mounting surfaces

Lightweight Design – Approx. 85g

Each brake caliper weighs approximately 85g, excluding brake pads and mounting bolts.

An ideal option for riders interested in lightweight road bike components.

High-Performance Heat-Dissipating Brake Pads

The included brake pad design features a metal-based friction material and a heat-dissipating backing structure.

Designed to help manage heat during braking.

Mineral Oil Hydraulic System

Designed for mineral oil hydraulic braking systems.

Compatible with BH59 / BH90-type brake hose connections, subject to correct fitting and hydraulic system compatibility.

Do not use DOT brake fluid.

140mm / 160mm Rotor Compatibility

Designed for use with compatible 140mm and 160mm brake rotors.

Correct mounting hardware or adapters may be required depending on the frame, fork, and rotor configuration.

Five Anodized Color Options

Available in:

• Black

• Silver

• Blue

• Purple

• Red

Choose a finish to match your bike's custom build.

Technical Specifications

Available Purchase Options

Single Caliper

Includes one IIIPRO 4-piston hydraulic brake caliper.

Pair

Includes two IIIPRO 4-piston hydraulic brake calipers.

Important Installation & Compatibility Information

• Verify the mounting interface and bolt-hole dimensions before ordering.

• Check compatibility with your existing hydraulic brake lever, hose fittings, and mineral oil system.

• Brake caliper compatibility cannot be determined by hose type alone.

• Maximum stated brake pad thickness is 2.2mm; however, pads thicker than 2.0mm are not recommended by the supplier because adjustment may become difficult.

• Do not overfill the hydraulic reservoir or caliper with mineral oil.

• Use only compatible brake pads, fittings, and mounting hardware.

• Professional installation and bleeding are strongly recommended.

• Always check brake operation, rotor clearance, and hydraulic sealing before riding.

Safety Notice: Brake components are safety-critical. Installation should be carried out by a qualified bicycle mechanic. Incorrect setup may result in reduced braking performance or brake failure.

Compatibility Check: Due to the complexity of original equipment manufacturer (OEM) parts' models and batches, there may be instances where this product is incompatible.

Upon receiving this product, please compare it with the OEM specifications to ensure compatibility before installation.

Torque Specifications: Install this product strictly according to the torque values specified in the OEM parts manual.Installation Issues: If you encounter any discrepancies with the OEM specifications or face difficulties at the initial stage of installation, stop immediately and contact customer service for assistance with returns or exchanges.

No Forced Installation: Do not force installation under any circumstances.Liability: Any damages resulting from forced installation or unauthorized modifications of this product (or its components) will be the sole responsibility of the buyer.

All products are photographed to accurately represent the colors you will see upon receipt.

Due to differences in lighting, angles, or screen settings, slight color variations may occur.

The actual product should be considered the standard.For "colored" and "blue" products, the coloring process may result in uneven color distribution, making each product unique.