ZOOM HB-100 Cable-Actuated Hydraulic Disc Brake Caliper Set, Black, 2-Piston Forged Aluminum, 160mm Rotor Compatible

ZOOM HB-100 is a cable-actuated hydraulic disc brake caliper set designed to deliver strong, consistent stopping power for mountain bikes, e-bikes, foldables and scooters.

These HB-100 calipers combine a compact one-piece forged aluminum body with internal oil-driven pistons and fine-tune adjustment to give riders predictable braking performance across varied terrain. They’re built to accept 160 mm rotors, include two-piston oil cylinders for balanced pad engagement, and are compatible with common cable-actuated hydraulic systems used on many modern bicycles and light electric vehicles.

How do the HB-100 calipers generate dependable stopping force?

The HB-100 uses an oil-filled cylinder and two pistons to press brake pads from both sides of the rotor, producing smooth, centered braking with strong clamp force. Cable actuation translates lever input into hydraulic pressure, which multiplies your braking input for effective modulation.

• Oil cylinder-driven 2-piston design for balanced pad movement
• Cable-actuated hydraulic operation for consistent pressure
• One-piece forged aluminum body for stiffness and heat management
• Designed for 160 mm rotor compatibility to standardize setup

Can I adjust these brakes for precise feel and lever reach?

Yes—the HB-100 includes internal fine-tuning screws that let you tweak cable tension and pad alignment so braking engages where you want it. Proper adjustment helps eliminate lever creep and maintains a consistent bite point across rides.

• Internal fine-tune screws for cable tension and pad position
• Adjustments available without removing the caliper from the frame in many setups
• Factory assembly includes a yellow piston block—do not remove before installation
• Pinch the lever only after full installation to avoid oil loss

What bikes and rotors are compatible with the HB-100 set?

These calipers are engineered to fit a wide range of bicycles and light electric vehicles, including mountain bikes, road bikes with disc mounts, folding bikes, e-bikes and electric scooters. They pair with 160 mm rotors; adapters or different rotor sizes may require additional mounts or spacers.

• Compatible with MTB, road, folding bikes, e-bikes and scooters
• Optimized for 160 mm rotor systems—adapter may be needed for other sizes
• Works with common cable-actuated hydraulic brake levers
• One-piece forged aluminum and CNC-machined parts improve durability

What should I watch for during installation and maintenance?

Follow the manufacturer’s installation steps closely to prevent hydraulic fluid loss or damage. The HB-100 ships with a yellow piston block to protect seals; keep it in place until the caliper is mounted and secured. Avoid pinching the lever before the system is fully installed to prevent oil leaks.

• Do not remove yellow piston block until caliper is mounted
• Do not squeeze the brake lever before installation to avoid oil leakage
• Bleed and torque to manufacturer specs after mounting and routing cables
• Regularly inspect pads, rotor alignment and cable tension for safe operation

Who is this for? Riders upgrading from mechanical to cable-actuated hydraulic setups or replacing worn calipers on mountain bikes, e-bikes, foldable bikes and electric scooters will appreciate the HB-100’s blend of compact forged construction, two-piston oil actuation and onboard fine-tuning. It’s aimed at cyclists who want stronger bite and cleaner modulation than basic mechanical systems while keeping installation familiar to cable-operated brake lever setups. Suitable for commuters, trail riders and urban e-bike users who value predictable stopping power and straightforward adjustment.