How to Bleed & Replace Brake Fluid on a 2021 CFMOTO CFORCE 800 XC EPS

Shop parts for a 2021 CFMOTO CFORCE800XC ATV.

This procedure covers a full brake fluid replacement and bleed on the 2021 CFMOTO CFORCE 800 XC EPS. It assumes the machine has hydraulic disc brakes front and rear, a handlebar master cylinder reservoir, and no vehicle ABS. Use DOT 4 brake fluid unless your service manual specifies otherwise.

Tools & supplies

  • DOT 4 brake fluid, unopened bottle
  • Clear vinyl tubing to fit bleeder nipples
  • Clean catch container (marked for brake fluid)
  • Socket set, open wrench for bleeder nipples
  • Brake bleeder kit or vacuum pump (optional)
  • Shop rags, isopropyl alcohol for cleanup
  • Gloves & eye protection
  • Service manual for torque values and bleed order

Model notes & pre-checks specific to the CFORCE 800 XC EPS

  • The CFORCE 800 XC EPS uses hydraulic discs front and rear; both calipers must be bled when replacing fluid.
  • Power steering (EPS) systems are electrical on this model and do not affect brake bleeding, but keep battery charged during the job to avoid electrical resets.
  • Check the master cylinder reservoir orientation on the handlebar – fluid level must be visible and clean of debris before opening.
  • Use only DOT-rated fluid recommended by the manual – do not mix DOT 3 with DOT 4 or use mineral oil.
  • Store and dispose of old brake fluid responsibly — it is corrosive and will damage paint and plastics.

Preparation

  1. Park the ATV on level ground and secure it so it cannot roll. Turn ignition off.
  2. Clean around the master cylinder cap and reservoir; remove cap and diaphragm carefully to avoid contamination.
  3. Top reservoir with fresh DOT 4 fluid to the specified level; keep the cap loosely set aside to reduce fluid exposure to air.
  4. Identify the bleed order. If factory info is unavailable, use the general rule: bleed from the caliper furthest from the master cylinder first, then progress to the nearest.
  5. Attach clear tubing to the caliper bleeder nipple and submerge the other end in a small amount of fresh fluid in the catch container to prevent air re-entry.

Bleeding procedure – two common methods

1) Two-person pump method

  1. Person A sits on the seat and slowly pumps the brake lever 3–5 times, then holds steady pressure on the lever.
  2. Person B opens the bleeder nipple about 1/4 turn to let fluid and air escape into the tubing; close the nipple before the lever is released.
  3. Person A releases the lever slowly after the nipple is closed. Repeat until no air bubbles appear in the tubing and the expelled fluid is clear.
  4. Keep the master cylinder topped off during the process to avoid running dry.

2) Vacuum/pressure bleeder

  1. Attach the vacuum bleeder to the bleeder nipple or use a pressure-supply reservoir on the master cylinder per the tool instructions.
  2. Operate the tool until clear fluid free of bubbles runs to the container. Maintain reservoir level and follow the tool manufacturer steps exactly.

Bleed sequence

  • Front right caliper > Front left caliper > Rear caliper(s), or follow the factory-specified order in your service manual.
  • Repeat the full sequence if the lever feels spongy. Proper pedal/lever feel should be firm with no travel that feels sponge-like.

Finishing steps

  • When all calipers show clear, bubble-free fluid, tighten bleeder nipples to the correct snugness; use manufacturer torque if available.
  • Top the master reservoir to the proper level, reinstall diaphragm and cap, and clean any spilled fluid immediately with isopropyl alcohol.
  • Cycle the brakes several times with the machine off and then with the engine running to confirm consistent, firm lever feel.
  • Check for leaks around bleeder nipples, hoses, calipers, and the master cylinder after a short test ride. Re-torque fasteners per the service manual if needed.
  • Record the date and mileage of the fluid change — brake fluid is hygroscopic; replace every 1–2 years depending on use.

Safety reminders

  • Never let the reservoir run dry mid-procedure; this will pull air into the system and require repeating the bleed.
  • Brake fluid damages paint and plastic – protect bodywork and clean spills immediately.
  • Use only the DOT fluid specified; mixing different brake fluids can reduce performance or cause seal damage.
  • If you cannot achieve firm brakes after multiple bleeding attempts, consult a professional technician — internal caliper or master cylinder issues may exist.

Complete the job by disposing of old fluid as hazardous waste and storing any remaining DOT 4 in a sealed container away from moisture. After service, perform a cautious test ride to verify braking performance under low-speed conditions before normal operation.

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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.