React 4 Piston Hydraulic Brake Set - Clarks Cycle Systems
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Product Information
Full details
The Clarks Cycle Systems C4 is a competition-level 4-piston hydraulic disc brake set designed for mountain bikes and hybrid bikes, offering powerful, smooth, and modulated braking with advanced features like self-adjusting pistons and on-the-fly lever reach adjustment. While providing excellent control and reduced pad wear through its CNC caliper design and heat dissipation, users may need to familiarize themselves with the setup process for optimal performance.
All features
| Series | C4 |
|---|---|
| Model Part Number | REACT-4-FR203180AM-IS UK |
| Brand | Clarks |
Extended Product Information
FAQs
What type of brake fluid does the C4 system use?
Clarks Cycle Systems typically uses mineral oil for their hydraulic brake systems. Always confirm with the product manual or manufacturer for the specific fluid type.
How often should I bleed my hydraulic brakes?
The frequency depends on usage and conditions, but a general guideline is every 6-12 months, or whenever you notice a spongy lever feel or reduced braking performance.
Can I use aftermarket brake pads with the C4 system?
Yes, but it's recommended to use pads specifically designed for 4-piston hydraulic disc brakes and compatible with Clarks systems to ensure optimal performance and longevity.
What is the benefit of a floating rotor?
Floating rotors help prevent brake fade under heavy use by allowing the braking surface to expand and contract independently of the carrier, reducing heat transfer and potential warping.
How do I adjust the lever reach on the C4 brakes?
Locate the small screw on the brake lever. Turning this screw adjusts the distance of the lever blade from the handlebar, allowing you to fine-tune the position for your hand size and comfort.
Are these brakes suitable for downhill mountain biking?
The C4 is a competition-level brake set suitable for aggressive trail riding and can handle demanding downhill sections. For extreme downhill applications, always consider brakes specifically designed for that purpose.
How do I clean the hydraulic brake system?
Clean the caliper, lever, and rotor with mild soap and water or isopropyl alcohol. Avoid getting oil-based lubricants on the rotor or pads. Never use harsh solvents.
Troubleshooting
Brake lever feels spongy or pulls too close to the handlebar
The hydraulic system likely needs bleeding to remove air bubbles. Consult a professional or follow the specific bleeding procedure for your brake set.
Braking power is weak or inconsistent
Check for contamination on the rotor or pads; clean them with isopropyl alcohol. Ensure brake pads are not excessively worn. Verify the hydraulic system is properly bled and has adequate fluid.
Grinding noise during braking
Inspect brake pads for debris or uneven wear. Ensure the rotor is clean and free from damage. Check that the caliper is aligned correctly with the rotor.
Brake lever is stiff or difficult to actuate
Ensure the brake hose is not kinked or obstructed. Check that the lever reach adjustment screw is not fully closed. Lubricate pivot points if necessary.
Rotor is rubbing against the caliper
Adjust the caliper alignment by slightly loosening the mounting bolts, squeezing the brake lever firmly, and then re-tightening the bolts while holding the lever. Ensure the wheel is seated correctly.
Pros and Cons
Pros
- Powerful and consistent braking performance
- Excellent modulation for controlled stopping
- Adjustable lever reach for personalized fit
- Durable construction with heat dissipation features
- Reduced pad wear due to efficient design
- Suitable for demanding MTB and Hybrid applications
Cons
- Setup may require some mechanical knowledge
- Potential for longer lever throw compared to some systems
- Floating rotor might require specific maintenance considerations
- Hydraulic systems generally require specialized tools for bleeding
- Initial cost might be higher than entry-level brakes
Setup, Compatibility & Care
Setup: Ensure the brake levers are mounted securely to the handlebars. Route the hydraulic hoses carefully, avoiding sharp bends, and connect them to the appropriate caliper and lever ports. For initial setup and bleeding, it is recommended to consult a professional bike mechanic or follow the detailed instructions provided with the brake set, as proper bleeding is crucial for optimal hydraulic performance. The included floating rotor should be mounted to the wheel hub using the correct number of bolts and torqued to manufacturer specifications.
Compatibility: The C4 brake set is designed for use on most mountain bikes and hybrid bikes. Ensure your frame and fork have the necessary post-mount or compatible disc brake mounts. Verify that your wheels are compatible with disc brake rotors and that the frame/fork clearance is sufficient for the caliper and rotor size.
Care: Regularly inspect brake pads for wear and replace them when necessary. Keep the braking surfaces of the rotor and pads clean from contaminants like oil or grease. Periodically check the hydraulic fluid level and condition; if the levers feel spongy, the system may require bleeding. Clean the caliper and lever body with a damp cloth and mild soap; avoid abrasive cleaners. After washing the bike, it is good practice to gently wipe down the rotor with isopropyl alcohol to ensure optimal braking performance.