How to Bleed and Replace Brake Fluid on a 2022 CFMOTO CFORCE 400

Shop parts for a 2022 CFMOTO CFORCE400 ATV.

This MotoSport guide walks you through a safe, effective procedure to replace and bleed the brake fluid on a 2022 CFMOTO CFORCE 400. Follow each step carefully, use clean tools and recommended fluid, and perform a final road test in a safe area.

What you need

  • DOT 4 brake fluid (fresh, unopened bottle)
  • Clear plastic tubing that fits snugly over bleeder nipples
  • Small catch bottle or jar (marked for used brake fluid)
  • Wrenches for bleeder nipples (typically 8-10 mm)
  • Brake bleeder or one-way bleeder valve (optional but speeds process)
  • Clean rags and brake cleaner
  • Gloves and eye protection
  • Zip-lock bags or shrink wrap to protect master cylinder and electrical connectors
  • Torque wrench (for caliper hardware if removed)

Model-specific notes for the 2022 CFMOTO CFORCE 400

  • The CFORCE 400 uses a handlebar-mounted master cylinder and a single front master with separate rear circuit via proportioning. MotoSport recommends DOT 4 for optimal performance; always confirm your owner's manual before service.
  • The brake reservoir is compact and plastic – take care not to overfill or spill fluid on painted plastics because brake fluid can damage finishes.
  • This model does not have ABS hardware, so bleeding is performed manually on each caliper. The standard factory caliper layout is two front calipers and two rear calipers on single-axle rear; use the bleed sequence outlined below.
  • If your CFORCE has an aftermarket winch or electrical accessories, protect connectors and battery terminals from spilled fluid or drips during the job.

Preparation

  • Park the ATV on level ground, engine off, key removed. Secure on a center stand or jack so wheels are off the ground and can rotate freely.
  • Clean the master cylinder cap area thoroughly. Remove the cap and diaphragm and cover the reservoir with a clean rag to prevent contamination.
  • Inspect hoses and lines for cracks, bulges, or leaks. Replace any damaged components before bleeding.
  • Label or note wheel positions if you'll remove calipers; keep hardware organized for reassembly.

Bleed sequence

Always start with the caliper farthest from the master cylinder and move to the closest. For the CFORCE 400, use this common order:

  1. Right rear (farthest)
  2. Left rear
  3. Right front
  4. Left front (closest)

Step-by-step bleeding & fluid replacement

  1. Top up reservoir with fresh DOT 4 fluid to the max line but do not overfill.
  2. Attach a clear plastic tube to the bleeder nipple of the farthest caliper; place the other end into the catch bottle partially filled with some old fluid to prevent air re-entry.
  3. Have an assistant slowly squeeze the brake lever/pedal several times and hold pressure. Open the bleeder nipple about a 1/4 to 1/2 turn to allow fluid and air to flow into the tube. Close the nipple, then instruct the assistant to release the lever/pedal. Repeat until clear, bubble-free fluid flows.
  4. Keep the reservoir topped between cycles so it never runs dry. Refill as needed during the process.
  5. Move to the next caliper and repeat the same process following the bleed sequence. Always ensure the bleeder nipple is securely closed before moving on.
  6. When bubbles are gone from all calipers and fresh fluid appears, tighten all bleeder nipples to the correct snug setting. Wipe any spilled fluid from surfaces immediately.
  7. Replace the reservoir diaphragm and cap. Clean the exterior with brake cleaner if needed.
  8. Dispose of used fluid responsibly – do not pour down drains or on soil.

Bench tips & troubleshooting

  • If air persists, try a pressure or vacuum bleeder to draw fluid through faster and more reliably.
  • One-person bleeding tools or one-way valves can let you perform the job solo without an assistant.
  • If a caliper still feels spongy after bleeding, check caliper pistons for corrosion or sticky movement; rebuilt calipers or new seals may be required.
  • Always replace the master cylinder cap seal if brittle or deformed — a bad seal will draw air back in.

Final checks

  • With the vehicle supported, spin each wheel and apply the brake to confirm engagement and no dragging.
  • Lower the ATV and perform a low-speed test in a controlled area to confirm pedal/lever firmness and even braking. Rebleed if softness or uneven braking is detected.
  • Record the service date and fluid type in your maintenance log. MotoSport recommends checking brake performance again after the first short ride and re-torquing any hardware if needed.

Safety reminders

  • Brake fluid is corrosive to paint and plastics. Wipe spills immediately and protect painted surfaces during service.
  • Never mix DOT 3 and DOT 5 fluids; DOT 5 is silicone-based and incompatible with DOT 4. If uncertain, flush system fully and use DOT 4 only.
  • If you notice compromised lines, soft brake lever action despite repeated bleeding, or visible leaks, stop and replace components before riding.

Follow this MotoSport procedure to keep your 2022 CFMOTO CFORCE 400 braking system reliable and responsive. When in doubt, consult a qualified technician or your ATV dealer for service support.

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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.