How to bleed and replace brake fluid on a 2021 CFMOTO CFORCE 500 EPS
Shop parts for a 2021 CFMOTO CFORCE500EPS ATV.
This MotoSport guide walks you through safely replacing and bleeding the brake fluid on a 2021 CFMOTO CFORCE 500 EPS. It's written for owners who want a reliable, model-specific procedure and the precautions unique to this MMY ATV. Follow the steps exactly, use the recommended fluid, and dispose of old fluid responsibly.
What you need
- DOT 4 brake fluid (CFMOTO recommends DOT 4; do not mix with DOT 5 silicone)
- Clear plastic tubing that fits the bleeder nipple
- Catch bottle for old fluid
- Hand or vacuum brake bleeder
- 8 mm wrench or socket (verify bleeder size on your unit)
- Phillips screwdriver or wrench for reservoir cap fasteners
- Clean lint-free rags and isopropyl alcohol
- Torque wrench (for reassembly where torque specs apply)
- Protective gloves & eye protection
Model-specific notes for the 2021 CFORCE 500 EPS
- The CFORCE 500 EPS uses hydraulic disc brakes front and rear with a handlebar front master cylinder and a rear master cylinder near the foot controls. There is no factory ABS on this model year, but EPS refers to electric power steering only.
- Reservoirs are visible and accessible after removing the small front cover and/or seat access panel on some trims. Always clean around the reservoir cap before opening to avoid contamination.
- Use only DOT 4 fluid to match OEM specs. Mixing DOT 3 and DOT 4 is possible but not recommended if you want boiling point consistency; never use DOT 5 silicone.
- Bleeder nipple sizes and caliper hardware can vary by production batch; have an 8 mm wrench and a 10 mm at hand and verify before forcing tools.
Safety first
- Work on a level surface with the ATV securely chocked and ignition off.
- Wear gloves & eye protection. Brake fluid damages paint and plastic — clean spills immediately.
- Do not reuse drained fluid. Dispose of old fluid according to local hazardous waste rules.
Step-by-step: drain, replace & bleed
- Prepare the machine: Park level, block wheels, and remove key. If necessary, remove small plastic panels to access both master reservoirs. Clean around reservoir caps with a lint-free rag and isopropyl alcohol.
- Inspect reservoirs: Note fluid condition and level. If extremely dark or contaminated, a full system flush is required (proceed).
- Open reservoirs: Carefully remove caps and diaphragms. Keep contaminants out and work quickly to minimize air entry.
- Top up with fresh DOT 4: Fill both reservoirs to the "MAX" line with fresh DOT 4. Keep caps loose but in place when not actively adding fluid to limit dirt ingress.
- Start with the furthest caliper: On CFORCE 500 EPS do the bleeds in this order for best results — rear caliper (farthest from master), then right front, then left front. If your machine has a single combined reservoir for front brakes, follow the same pattern.
- Attach tubing & catch bottle: Place clear tubing over the bleeder nipple and submerge the other end in a small amount of fresh fluid in the catch bottle to prevent air re-entry.
- Open bleeder and pump: With the bleeder nut closed, have a helper slowly squeeze the brake lever/pedal 3-5 times and hold pressure. Open the bleeder nipple about a half-turn with the wrench to let fluid & air out. Close the nipple, then release the lever. Repeat until clear fluid with no bubbles appears. If using a vacuum or one-man bleeder, follow that tool's procedure while keeping reservoir level topped up.
- Maintain reservoir level: Keep an eye on the master reservoir and top up frequently to prevent air from entering the master cylinder. Never run the reservoir dry while bleeding.
- Repeat for each caliper: Work through the sequence (rear, right front, left front). Each caliper may take several cycles until bubbles stop.
- Final system check: When bleeding is complete, tighten bleeder nipples to their snug torque (do not overtighten; hand-tight plus a fraction with wrench). Wipe all fittings clean.
- Top off & close reservoirs: Refill to the proper MAX level, reinstall diaphragms and caps, and secure any paneling you removed.
- Test lever & pedal feel: With the ATV securely chocked, operate the brakes several times to confirm firm lever/pedal feel and no sinking. If the lever is spongy, repeat bleeding.
- Road/test in safe area: Slowly ride in a controlled area and perform progressive stops to confirm braking performance before regular use.
Troubleshooting & tips
- Persistent sponginess: Check for a leak, contaminated lines, collapsed hoses, or a bad master cylinder. Inspect hose ends and banjo bolts for seepage.
- Air high in the system: If you suspect air in the master cylinder itself, remove and bench-bleed the master per the service manual before repeating caliper bleeding.
- Protect paint & plastics: Keep a rag between components and avoid spilling fluid on bodywork. If spilled, wash immediately with water.
- Bleeder hardware: If a bleeder nipple is rounded or stuck, apply penetrating oil and work gently. Replace damaged bleeders instead of force-damaging the caliper.
Maintenance schedule & recommendations
- Brake fluid replacement interval: Replace fluid every 1-2 years depending on usage and exposure to water or heavy-duty use.
- Inspect lines & pads: Whenever you service fluid, inspect caliper seals, pads, and hydraulic lines for wear or damage.
- Record service: Note date and mileage/hours in your maintenance log to keep consistent service intervals.
Follow this MotoSport procedure to keep the CFORCE 500 EPS braking system reliable and responsive. If you run into unusual issues, consult an authorized CFMOTO technician for diagnostics and repairs beyond basic bleed & fluid replacement.
Related Shopping Categories
Shop Brake Fluid for a 2021 CFMOTO CFORCE500EPS ATV.
Shop Brake Bleeders for a 2021 CFMOTO CFORCE500EPS ATV.
Shop Brake Pads for a 2021 CFMOTO CFORCE500EPS ATV.
Shop Brake Lines for a 2021 CFMOTO CFORCE500EPS ATV.
Shop Brake Tools for a 2021 CFMOTO CFORCE500EPS 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.