How to Bleed and Replace Brake Fluid on a 2021 Yamaha Kodiak 700 4X4 EPS IRS

Shop parts for a 2021 Yamaha Kodiak 700 4X4 EPS IRS ATV.

Overview

This procedure covers draining, flushing, and bleeding the hydraulic brake system on the 2021 Yamaha Kodiak 700 4X4 EPS IRS. The Kodiak uses a sealed master cylinder and hydraulic calipers on each wheel. Use only DOT 4 brake fluid unless the owner's manual specifies otherwise. Work in a clean, well-ventilated area and protect painted surfaces from spilled fluid.

Tools & Supplies

  • DOT 4 brake fluid (only new, unopened container)
  • Brake bleeder kit (vacuum pump or hand-pump or clear tubing & catch bottle)
  • Wrenches or sockets to fit bleed nipples and caliper bolts
  • Torque wrench set to factory specs
  • Clean rags, gloves, eye protection
  • Brake cleaner, plastic scraper or nylon brush
  • Jack and stands or ramps to safely raise/stabilize ATV
  • Disposable syringe or turkey baster (for removing old fluid from reservoir)
  • Small funnel with clean filter if adding fluid to reservoir

Model Notes & Safety Items Specific to the 2021 Kodiak 700 EPS IRS

  • The Kodiak 700 has Electric Power Steering (EPS). Avoid turning the EPS on while wheels are off the ground for extended periods; follow Yamaha EPS service cautions if disconnecting the battery or steering components.
  • Independent Rear Suspension (IRS) gives two rear calipers to access separately. Treat left/right circuits individually and maintain reservoir level throughout.
  • Brake fluid is hygroscopic. If fluid looks dark or contaminated, replace it system-wide now &mdash do not mix old and new in the reservoir.
  • Do not let brake fluid contact painted plastic or metal components; it will damage finishes. Wipe spills immediately and rinse with water if needed.
  • Always use factory torque specs for caliper and banjo bolts; if unsure, consult the Yamaha service manual before final torqueing.

Preparation

  • Park ATV on level surface, engage parking brake, put in gear, and disconnect battery negative if you will be working around EPS electrical components.
  • Raise and support the ATV so wheels involved can turn freely for pedal actuation. Chock wheels left in contact with ground.
  • Clean area around master cylinder reservoir cap to prevent contamination when opened.
  • Remove wheels if needed for easier caliper access.

Step 1 Inspect & Remove Old Fluid from Reservoir

  • Open the reservoir cap and remove the diaphragm or cover. Use a syringe or turkey baster to remove as much old fluid as possible without letting air enter the system beyond what's unavoidable.
  • Wipe interior with a clean lint-free cloth if necessary. Reinstall the reservoir cover loosely to slow contamination while you work.

Step 2 Decide Bleeding Sequence

Always start bleeding at the caliper farthest from the master cylinder and finish with the closest. On the Kodiak 700, that sequence will normally be: rear right, rear left, front right, front left. Confirm by locating the master cylinder and selecting the farthest calipers first.

Step 3 Flushing & Bleeding Method (Vacuum or Manual)

Either a vacuum bleeder or a two-person pump method works. Vacuum bleeder is cleaner and recommended for RV/ATV use.

Vacuum Bleeder Method

  • Attach clear tubing from the caliper bleed nipple to a catch bottle partially filled with fresh fluid to avoid drawing air back in.
  • Open the bleed nipple ~1/4 turn. Apply vacuum and have an assistant pump the brake lever/pedal slowly while you maintain vacuum. Keep the master reservoir topped with DOT 4 fluid so it never runs dry.
  • When fluid runs clear with no bubbles, tighten bleed nipple while vacuum is still applied. Close reservoir and move to next caliper.

Two-Person Manual Method

  • One person pumps the brake lever/pedal several times and holds pressure; second person opens bleed nipple to let fluid and air escape, then closes nipple before lever/pedal is released. Repeat until clear fluid without bubbles appears, topping reservoir often.

Step 4 Bleed Each Caliper

  • Start with the farthest wheel as chosen above. For each caliper: open bleed nipple, extract fluid until clear, then tighten nipple to stop flow. Do not over-tighten; snug to stop leaks and finish to factory torque.
  • Keep reservoir topped to avoid introducing air. After each caliper, check brake pedal feel before moving on.
  • Repeat each caliper if pedal feels spongy after initial pass. It may require two full passes to remove all old fluid and air.

Step 5 Replace All Fluid & Final Flush

  • Once bleeding is complete and clear fluid flows from every caliper, perform one final flush by continuing to add fresh DOT 4 while bleeding until the reservoir and calipers contain only clear new fluid.
  • Close bleed nipples, fill reservoir to the specified level, reinstall diaphragm and cap securely.

Reassembly & Final Checks

  • Reinstall wheels and torque lug nuts and caliper/banjo bolts to factory values. If you don't have the spec, consult the service manual before first ride.
  • Clean any spilled fluid and inspect all lines, fittings, and hoses for leaks.
  • Reconnect battery negative if disconnected. Start ATV, cycle brakes slowly to confirm firm pedal/lever feel. Park ATV and test brakes at low speed in a safe area before normal riding.

Troubleshooting & Tips

  • Persistent spongy brake feel after multiple bleeds indicates trapped air, a leaking hose/fitting, or a master cylinder issue; inspect hoses for deterioration and replace if soft or bulging.
  • If caliper pistons are sticky or pads are unevenly worn, remove caliper, clean, and service pistons and slides or replace calipers/pads as needed.
  • Never reuse brake fluid. Dispose of old fluid properly per local regulations.
  • Keep a maintenance log &mdash note fluid change date and mileage for future service intervals; DOT 4 typically recommends replacement every 1-2 years depending on use and moisture ingress.

Final Safety Reminder

After service, confirm brake performance in a controlled environment. If you are not confident or if braking problems persist, have the system inspected by a qualified technician. Proper braking is critical for safe operation of your Kodiak 700.

 

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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.