The Clarks CMD‑22C Mechanical disc brake set offers a balanced blend of mechanical reliability, straightforward installation, and consistent braking power. Designed with simplicity in mind, it appeals to both budget-conscious cyclists and mechanics looking for a no-nonsense setup. This guide explores every facet of the CMD‑22C Mechanical brake system, from installation and maintenance to performance optimization and compatibility.
Tools Required
- 5mm and 6mm Allen keys
- Torque wrench (Nm scale)
- Cable cutters
- Disc rotor truing tool
- Isopropyl alcohol and clean cloths
- Mechanical cable and housing set
- Flathead screwdriver
- Rotor lockring tool (if applicable)
Installation of the CMD‑22C Mechanical Brake Set
Installing the CMD‑22C brake set begins with securing the calipers to the frame or fork via the Post Mount or IS adapter. The calipers come pre-centered for ease of setup. Use the 5mm Allen key to secure bolts and a torque wrench to apply the manufacturer’s recommended torque values, typically around 6–8 Nm.
Next, mount the disc rotors to the hubs. Ensure the rotors are oriented in the correct direction, with arrow markings facing the forward wheel rotation. For centerlock rotors, use the appropriate lockring tool; for 6-bolt designs, torque each bolt in a star pattern.
The brake lever and cable installation follow. Feed a lubricated cable through the housing, ensuring minimal friction. Attach the cable to the caliper arm while maintaining pad clearance. Finally, secure the cable clamp bolt and trim excess cable.
Adjusting the Calipers for Optimal Performance
The CMD‑22C features a single-piston mechanical design, where only one pad moves while the other remains static. To align properly:
- Loosen the mounting bolts slightly.
- Squeeze the brake lever to center the moving pad onto the rotor.
- While holding the lever, tighten the bolts evenly.
Adjust the static pad by turning the inboard pad adjustment dial. The clearance between rotor and pad should be minimal without rubbing. The outboard pad is fixed but fine-tuned by cable tension.
Lever feel can be refined by turning the barrel adjuster. Too much slack may lead to lever bottoming out before full engagement, while overtensioning risks rotor drag.
Routine Maintenance of CMD‑22C Brakes
Maintenance primarily revolves around keeping the system clean and cable tension intact. Routinely inspect the rotor surface for contaminants. Clean using isopropyl alcohol and a lint-free cloth. Avoid touching the braking surface with bare hands.
Check cable condition biweekly or after wet rides. Frayed or corroded cables should be replaced. Lubricate the inner cable lightly where it exits the housing to reduce resistance and improve lever feel.
Pad wear should be checked monthly. CMD‑22C pads have a wear line or indicator—replace when material is under 1mm. Use Clarks-compatible mechanical disc pads for optimal fit and performance.
Troubleshooting Common Set-Up Issues
Rotor Rub: Often caused by improper caliper centering. Loosen bolts, squeeze the lever, and retighten to recenter. If rubbing persists, inspect rotor trueness.
Spongy Lever Feel: Usually a result of cable slack or housing compression. Adjust the barrel adjuster or replace worn housing.
Uneven Pad Wear: May result from misaligned calipers or a sticking piston. Since CMD‑22C uses a single moving pad, uneven wear is expected but should remain within tolerances.
Noisy Braking: Clean the rotor and pads. If noise persists, slightly chamfer pad edges or bed-in the system by performing controlled stops from medium speed.
Customizing and Optimizing Brake Performance
While mechanical disc brakes lack hydraulic modulation, they can be finely tuned through several methods. Upgrading to compressionless housing significantly improves lever response. Lighter or ergonomically designed levers can enhance rider control.
Pairing the CMD‑22C with high-friction semi-metallic pads can improve bite, especially in wet conditions. Alternatively, resin pads offer quieter operation at the cost of a slight reduction in stopping power.
Rotor size upgrades (from 160mm to 180mm) are possible if frame and fork clearance allow. This increases leverage and stopping force, especially for heavier riders or those tackling descents.
Compatibility with Other Drivetrain Components
The CMD‑22C is compatible with most road and hybrid mechanical brake levers using a standard cable pull ratio. Shimano STI levers, SRAM mechanical road levers, and MicroSHIFT units typically function well with it.
It is not suitable for use with V-brake or linear-pull levers due to the difference in mechanical leverage. Check for caliper-actuated cable routing to ensure proper fit.
The rotors follow international standard specifications and are compatible with any 6-bolt or centerlock hub, provided the appropriate rotor type is selected.
CMD‑22C vs Other Mechanical Brake Models
CMD‑22C vs. TRP Spyre: The TRP Spyre features dual piston actuation, reducing rotor rub and improving pad wear balance. However, it comes at a higher price point.
CMD‑22C vs. Avid BB5: Both use single piston designs, but the CMD‑22C offers a more compact form and easier pad adjustments. BB5s have more aftermarket support but require tool-based adjustments.
CMD‑22C vs. Shimano BR-RS305: The Shimano BR-RS305 is tailored for road integration and cleaner aesthetics but lacks external pad adjustment knobs, making the CMD‑22C more user-serviceable.
The CMD‑22C stands out for its affordability, ease of maintenance, and minimal setup complexity.
FAQs
What kind of pads does the CMD‑22C use?
The CMD‑22C uses standard mechanical disc brake pads. Clarks offers direct replacements, but several aftermarket brands provide compatible options.
Can I use hydraulic levers with the CMD‑22C?
No. The CMD‑22C is designed solely for mechanical levers. Hydraulic levers operate on fluid displacement and are incompatible.
How often should I replace the brake pads?
Inspect monthly and replace when the pad thickness falls below 1mm or if you hear consistent metal-on-metal noise during braking.
Is it compatible with flat mount frames?
The CMD‑22C is primarily a post mount caliper. An adapter may be needed to install it on flat mount frames, if frame spacing allows.
What size rotors can I use with CMD‑22C?
The system typically ships with 160mm rotors, but you can upgrade to 180mm for more braking power, assuming your frame or fork supports it.
Why does only one pad move in this system?
This is a single-piston mechanical design. The moving pad pushes the rotor into the fixed pad, creating friction. It’s simpler but requires careful centering to prevent rub.
Conclusion
The CMD‑22C Mechanical brake set from Clarks represents a well-engineered, affordable solution for riders seeking mechanical disc braking without excessive complexity. Its straightforward installation, robust construction, and accessible adjustments make it ideal for DIY maintenance and commuter builds. With proper setup and occasional care, the CMD‑22C delivers dependable braking performance across varied conditions.