The Yokozuna Motoko Hy/Mech [paid link] brake set is a standout innovation in the road bike braking market, integrating the benefits of both mechanical and hydraulic systems. This hybrid brake system is designed to provide enhanced braking power, easy cable actuation, and minimal maintenance, making it a compelling choice for riders seeking performance without the complexity of full hydraulic setups.
Tools Required:
- 5mm and 4mm hex wrenches
- Torque wrench with appropriate bits
- Cable cutters
- Brake fluid (mineral oil)
- Bleed kit compatible with Motoko calipers
- Rotor truing tool (if needed)
- Torque spec sheet (included with product)
Design and Construction Overview
The Motoko Hy/Mech is a cable-actuated hydraulic disc brake system. It uses standard mechanical brake levers to actuate a closed hydraulic system embedded within the caliper body. This setup removes the need for hydraulic levers and hoses, simplifying installation and reducing maintenance complexity.
The caliper body is constructed from forged aluminum, offering a balance between weight and heat dissipation. Inside the caliper, Yokozuna employs dual opposed pistons, which ensure even pad wear and stronger stopping force. The pads are sintered metal for superior performance in both wet and dry conditions.
Installation Procedure
Before installation, ensure the frame and fork are compatible with post-mount disc brakes. The Motoko system fits most road and gravel bikes that accommodate 160mm rotors.
The installation begins with mounting the caliper onto the frame or fork. Align the caliper using the supplied mounting bolts and torque them to 6–8 Nm. The cable is then routed from the mechanical lever to the caliper using standard compressionless housing. Insert the cable into the caliper’s actuation arm, secure it, and adjust tension.
During setup, the system is pre-bled from the factory, but slight adjustments might be necessary. Align the caliper with the rotor by actuating the lever lightly while tightening the mounting bolts, ensuring equal pad clearance on both sides of the rotor.
Adjustment and Fine-Tuning
Once installed, fine-tuning begins with adjusting the cable tension using the barrel adjuster. Proper tension ensures the lever has a firm feel and minimal travel. Check pad alignment and spacing to prevent rotor rub. If needed, realign the caliper or true the rotor.
The Motoko caliper includes a pad retraction mechanism that self-adjusts as the pads wear. This eliminates the need for frequent manual pad spacing corrections. However, it’s important to check for piston alignment and pad wear regularly to maintain optimal performance.
Maintenance Guidelines
Routine maintenance involves cleaning the caliper and rotor with isopropyl alcohol to prevent contamination. Inspect the pads for wear every 500–1000 miles, depending on terrain and conditions. Replace the pads when they reach 1mm thickness.
The hydraulic system uses mineral oil, which is less corrosive and safer to handle than DOT fluid. Although the system is sealed, periodic bleeding is recommended every 12–18 months to remove air bubbles and maintain braking consistency.
To bleed the brakes, use a compatible bleed kit. Remove the caliper from the frame and secure it horizontally. Insert the bleed syringe into the reservoir, open the bleed port, and slowly cycle fluid through the system until no air bubbles remain. Reinstall the caliper and test lever feel.
Troubleshooting Common Issues
Spongy Lever Feel:
This usually indicates air in the hydraulic system. Re-bleed the caliper thoroughly.
Rotor Rubbing:
Ensure the caliper is centered. Loosen mounting bolts, apply brake lever to center caliper, and re-tighten bolts.
Weak Braking Power:
Check pad wear, cable tension, and rotor cleanliness. Contaminated pads or rotors can reduce stopping force.
Pad Drag:
Inspect for piston sticking or improper pad retraction. Clean pistons and ensure smooth piston movement.
Performance Customization
To fine-tune the braking feel, users can switch between compressionless and standard housing. Compressionless housing improves lever feel and responsiveness. Additionally, using different rotor sizes can enhance modulation and stopping power. Upgrading to 180mm rotors in the front increases braking torque, beneficial for heavier riders or loaded touring setups.
Brake pad swaps also allow for performance tuning. Yokozuna offers resin and sintered options; resin pads provide quieter operation, while sintered pads handle heat better and offer longer lifespan in aggressive conditions.
Compatibility with Drivetrain Components
One of the main benefits of the Motoko system is its compatibility with a wide range of mechanical shifters and levers. It works seamlessly with Shimano, SRAM, and Campagnolo mechanical systems. However, lever cable pull must match Yokozuna’s specifications for optimal actuation. Pairing with levers designed for short-pull road calipers is recommended.
The Motoko is not compatible with hydraulic shifters or mountain bike brake levers due to mismatched pull ratios and mounting formats.
Comparing Motoko Hy/Mech to Similar Models
When compared to the TRP HY/RD [paid link], another popular cable-actuated hydraulic option, the Motoko offers a more compact caliper profile and simpler bleeding procedure. While the TRP unit includes a larger reservoir and slightly better modulation, the Motoko excels in ease of setup and overall value.
In contrast to full hydraulic systems like Shimano Ultegra R8070, the Motoko lacks the instantaneous response and fine-tuned lever feel of full hydraulic circuits. However, it dramatically simplifies maintenance and lowers the entry barrier for riders transitioning from rim brakes or mechanical disc systems.
Summary
The Yokozuna Motoko Hy/Mech brake set presents a unique solution for road cyclists who seek the power of hydraulic braking with the simplicity of mechanical systems. It balances performance, compatibility, and ease of use in a compact, serviceable package. With proper installation, regular maintenance, and fine-tuning, the Motoko delivers consistent braking performance across a wide range of riding conditions.