The Yokozuna Motoko Hy/Mech [paid link] brake system offers a unique hybrid solution for riders who appreciate the simplicity of mechanical actuation and the power of hydraulic braking. As with all disc brakes, proper maintenance of the pads is essential for performance and rider safety. This article provides a comprehensive guide on replacing brake pads specifically on the Motoko Hy/Mech calipers.

Tools Required

• 5mm hex wrench
• Needle-nose pliers or pad spreader tool
• Flathead screwdriver (optional)
• Replacement disc brake pads (compatible with Yokozuna Motoko Hy/Mech)
• Isopropyl alcohol (minimum 90%)
• Clean lint-free cloth or shop towels
• Small torque wrench (recommended)
• Bike stand (optional but helpful)

Understanding Pad Wear on the Motoko Hy/Mech

The Motoko Hy/Mech caliper uses a dual-piston, hydraulic internal system actuated by a mechanical cable. This design results in reliable modulation and stopping power but also requires regular inspection for pad wear. Brake pads should be replaced when the friction material is less than 1 mm thick or if contaminated with oil or debris.

Due to the caliper’s internal hydraulic mechanics, worn pads can reduce piston engagement, leading to poor braking response and increased lever travel.

Accessing the Brake Pads

Accessing the brake pads on the Motoko Hy/Mech caliper involves minimal disassembly. The caliper’s pad retention system allows tool-assisted removal without needing to disconnect the hydraulic line or cable.

1. Shift the wheel out of the dropouts for better access.
2. Insert a pad spreader or flathead screwdriver gently between the pads and pistons. Carefully push the pistons back into the caliper to ease pad removal and installation.
3. Locate the pad retaining pin. This pin holds the pads and spring in place inside the caliper body.

Removing the Old Pads

With the caliper accessible and pistons retracted:

• Use a 5mm hex wrench to unscrew the pad retention pin.
• Carefully slide the old pads and spring assembly out of the caliper.
• Inspect both pads for uneven wear or contamination, which could indicate alignment or rotor issues.

It’s critical to avoid touching the rotor or new pads with bare fingers to prevent contamination from oils or grease.

Installing the New Brake Pads

The Motoko Hy/Mech uses standard Shimano B-type pad shapes. Ensure the new pads are specific to disc braking and compatible with Yokozuna’s caliper body.

1. Insert the new pads and spring as a complete unit into the caliper, aligning them with the caliper slot.
2. Reinstall the pad retention pin and torque it securely to manufacturer specification (typically around 4-6 Nm).
3. Use the spreader tool again, if necessary, to ensure the pads are evenly spaced.

Check that both pads are symmetrical and flush with the rotor surface when the wheel is reinstalled.

Caliper Alignment Post Pad Replacement

Replacing brake pads can sometimes throw off caliper alignment. The Yokozuna Motoko Hy/Mech is particularly sensitive to even pad spacing due to its hybrid actuation.

• Loosen the caliper mounting bolts using a 5mm hex wrench.
• Squeeze the brake lever and hold it down firmly.
• While holding the lever, tighten the caliper bolts to approximately 6 Nm torque.
• Spin the wheel and ensure there is no rotor rub. If rubbing persists, fine-tune caliper positioning with micro-adjustments.

Bedding-In the New Pads

To achieve optimal braking performance and pad longevity, it’s essential to bed-in the new pads. This involves gradually heating the pads through controlled braking.

• Ride in a safe, flat area.
• Perform 15-20 gentle stops from moderate speed to almost a full stop, allowing the rotor to cool between each.
• Avoid complete stops during this process to prevent pad glazing.

Proper bed-in ensures the pad surface conforms to the rotor, improving brake response and reducing noise.

Troubleshooting Common Issues

Persistent Brake Rub:
Check piston retraction. Sticky pistons may not fully return after actuation, especially if dirt or dried fluid is present. Clean the pistons carefully with isopropyl alcohol before pad installation.

Soft Lever Feel After Pad Replacement:
This often results from incomplete piston reset. Reinsert the spreader tool and ensure the pistons are fully retracted. If the problem persists, bleed the hydraulic system inside the caliper.

Uneven Pad Wear:
Misaligned calipers or rotor wobble can cause this. Inspect rotor trueness and realign the caliper as needed.

Noise During Braking:
High-pitched squeals are usually due to contamination or improper bed-in. Clean the rotor thoroughly and repeat the bed-in process. Replace contaminated pads.

Customizing for Performance

While the Motoko Hy/Mech is optimized for general road use, riders can tweak performance by selecting different pad compounds:

• Organic Pads: Quieter and better modulation in dry conditions.
• Sintered Pads: Superior longevity and power, particularly in wet conditions.
• Semi-metallic Pads: A balanced option with moderate noise and durability.

Ensure that any pad chosen maintains compatibility with Yokozuna’s caliper design and lever ratios.

Compatibility with Other Components

The Motoko Hy/Mech is compatible with most road brake levers that use mechanical actuation, including Shimano STI, SRAM DoubleTap, and Campagnolo Ergopower. When replacing pads, always confirm compatibility not only with the caliper but with the rotor’s material and size.

Avoid mixing pad materials across front and rear brakes, as this can result in inconsistent braking feel.

Comparing Yokozuna Motoko Hy/Mech to Similar Models

Compared to other mechanical-hydraulic hybrid disc brakes like the TRP HY/RD [paid link] or Juin Tech GT, the Motoko stands out for its consistent modulation and cleaner mechanical interface. While it requires slightly more maintenance attention than fully mechanical systems, it delivers notably better braking control under load.

• TRP HY/RD: Easier pad access, but bulkier and heavier.
• Juin Tech GT: Lighter, but with slightly less stopping power and harder to align.
• Motoko Hy/Mech: Best overall balance between power, compatibility, and ease of adjustment.

Conclusion

Replacing brake pads on the Yokozuna Motoko Hy/Mech is a relatively straightforward process that can be done at home with basic tools and attention to detail. By following this guide, riders can ensure optimal braking performance and extend the life of their braking system. Regular inspections, proper bedding-in, and correct pad selection tailored to your riding style will keep your Motoko Hy/Mech brakes running smoothly and safely.