How to Bleed & Replace Brake Fluid on a 2024 CFMOTO CFORCE 400

Shop parts for a 2024 CFMOTO CFORCE 400 ATV.

This MotoSport proprietary guide covers tools, safety, model-specific notes, step-by-step flushing & bleeding procedures, and postop checks for your 2024 CFMOTO CFORCE 400. Follow factory torque specs and the fluid specification in your owner's manual; when in doubt confirm the correct DOT rating before purchasing fluid.

Tools & Supplies

  • Manufacturer-specified brake fluid (check owner's manual for DOT rating; many CFMOTO models call for DOT 4)
  • Brake bleeder kit or clear tubing & catch bottle
  • Wrenches for bleed nipples (typically 8mm or 10mm); flare nut wrench recommended
  • Screwdriver or trim tools to remove reservoir covers
  • Clean rags, gloves, safety glasses
  • Small funnel or syringe for filling
  • Torque wrench for reassembly where applicable
  • Isopropyl alcohol for cleaning spilled fluid

Safety & Prep

  • Work on a level surface with the engine off and key removed.
  • Park with the suspension at normal ride height when possible to avoid introducing air as components move.
  • Brake fluid damages painted surfaces – protect plastics and frame with rags or tape.
  • Dispose of old fluid responsibly per local regulations.

Model-Specific Notes for the 2024 CFORCE 400

  • The CFORCE 400 uses hydraulic disc brakes with separate front (handlebar-mounted) and rear master cylinders/reservoirs. Location: front reservoir is on the right handlebar; rear reservoir is near the rear brake pedal assembly or under a small cover. Verify exact locations on your machine before starting.
  • Some model years and trims may have combined reservoir routing or slightly different reservoir caps — remove plastic covers carefully and keep fasteners organized.
  • If your CFORCE 400 is equipped with any electronic brake-related assist or antilock system, reference the owner's manual before bleeding to avoid system faults. Basic CFORCE 400 trims typically have conventional hydraulic brakes without ABS, but verify your unit's configuration.
  • Master cylinder cap diaphragms should be replaced if brittle or contaminated; reuse risks air entry and contamination.

Step 1 Inspect & Prepare

  • Check fluid color and level in both reservoirs. Dark or contaminated fluid should be replaced.
  • Clean reservoir caps and surrounding areas to prevent contamination.
  • Remove reservoir covers and diaphragm caps; loosen cap but keep it on to avoid debris falling in until ready.

Step 2 Top Off Reservoir(s)

  • Top reservoirs with fresh brake fluid to the specified maximum line. Do not mix DOT types.
  • Keep the reservoir cap loosely on between steps to limit exposure to air.

Step 3 Bleeding Order

Use the standard sequence: farthest caliper from the master cylinder first, then progress toward the master cylinder. For the CFORCE 400 typical order is:

  1. Rear caliper (if rear master cylinder is separate, treat it as its own system)
  2. Right front caliper
  3. Left front caliper

If the CFORCE 400 on your unit routes differently, follow the visible hose routing from each master cylinder to the calipers.

Step 4 Manual Bleeding Procedure

  1. Attach clear tubing to the bleed nipple on the caliper and route into a bottle partially filled with some fresh brake fluid (prevents air re-entry).
  2. Open the bleed nipple about a quarter turn with a flare nut wrench.
  3. Have an assistant pump the brake lever or pedal slowly to build pressure, then hold steady.
  4. While pressure is held, open the bleed nipple slightly to let fluid/air escape, then close it before the assistant releases the lever/pedal.
  5. Repeat pump-open-close cycles until no air bubbles appear in the tubing and the fluid runs clear.
  6. Top off the reservoir as needed during the process to prevent running dry.
  7. Tighten bleed nipple to spec (hand-tight plus a small turn; check service manual torque if available).

Step 5 Vacuum or Pressure Bleeder Option

  • Connect vacuum bleeder to the caliper bleed nipple or use a pressure bleeder on the reservoir per tool instructions.
  • Operate the tool until clear fluid exits with no bubbles; monitor reservoir level and add fluid to avoid sucking air into the system.

Step 6 Reassemble & Test

  • Clean any spilled fluid immediately with isopropyl alcohol and rinse surfaces; brake fluid can damage plastics and paint.
  • Reinstall diaphragms and reservoir caps; torque fasteners per manual.
  • Check pedal/lever feel — it should be firm with no spongey travel. If still soft, re-bleed starting from the farthest caliper again.
  • Perform a low-speed controlled brake test in a safe area before riding hard.

Common Troubleshooting

  • Persistent sponginess: likely air still in the system or contaminated master cylinder; re-bleed and inspect master cylinder seals.
  • Leaking bleed nipple: replace the nipple or use the correct washer; overtightening can strip threads on some calipers.
  • Rapid fluid level drop in reservoir: check for leaks at lines, calipers, and master cylinder seals.

Maintenance Interval & Best Practices

  • Replace brake fluid every 1-2 years or per owner's manual to prevent moisture buildup and corrosion.
  • Always use fresh, unopened fluid from the manufacturer recommended DOT spec.
  • Keep a maintenance log with dates, fluid type, and mileage/hours to track service history for resale value and safety.

Final Notes Specific to Your 2024 CFORCE 400

  • Confirm reservoir locations and DOT rating on your machine before starting. The CFORCE 400's compact layout makes access easier on the front master cylinder but the rear reservoir may require removing small plastic panels.
  • If your unit has aftermarket accessories or skid plates, remove or loosen them for better access and to avoid trapping fluid on painted surfaces.
  • When in doubt or if you encounter seized fittings, contact a qualified technician or MotoSport service partner to avoid damage to calipers or brake lines.

Performing a full fluid replacement and proper bleed restores braking performance and extends component life. If you need replacement parts or OEM-recommended fluids for your CFORCE 400, visit our parts page linked above.

Related Shopping Categories

Shop Brake Fluid for a 2024 CFMOTO CFORCE 400 ATV.

Shop Brake Bleeders for a 2024 CFMOTO CFORCE 400 ATV.

Shop Brake Pads for a 2024 CFMOTO CFORCE 400 ATV.

Shop Brake Lines for a 2024 CFMOTO CFORCE 400 ATV.

Shop Brake Tools for a 2024 CFMOTO CFORCE 400 ATV.

Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.