How to Bleed and Replace Brake Fluid on a 2017 Kymco MXU 700i

Shop parts for a 2017 Kymco MXU 700i ATV.

This MotoSport-exclusive service guide walks you step-by-step through replacing and bleeding the brake fluid on a 2017 Kymco MXU 700i. Follow each step carefully, work cleanly, and use quality parts and fluid to maintain safe, reliable stopping performance.

What you need

  • DOT 4 brake fluid (new, unopened bottle)
  • Clear plastic tubing to fit bleed nipples
  • Small catch bottle (preferably with a one-way valve or a way to seal)
  • Box-end wrench set (bleeder wrench sizes commonly 8mm-10mm)
  • Syringe or turkey baster (for removing reservoir fluid)
  • Clean rags, brake-clean spray, nitrile gloves, eye protection
  • Service manual or notes for bleed sequence
  • Optional: vacuum bleeder or pressure bleeder for faster, cleaner bleeding

Model-specific notes for the MXU 700i

  • The MXU 700i uses a hydraulic brake system with a handlebar master cylinder for the front and a separate master/cylinder for the rear depending on configuration. Confirm your machine’s reservoir locations before beginning.
  • This model typically specifies DOT 4 brake fluid; always use fresh fluid and avoid mixing types. If your MXU has any aftermarket ABS module, consult the module documentation first. Most stock MXU 700i units are non-ABS.
  • Inspect brake lines & banjo fittings for wear and replace any hoses that are cracked, swollen, or leaking. Use new copper crush washers on banjo bolts when reinstalling.
  • Brake reservoirs on ATVs are small — don’t let them run dry during bleeding to avoid introducing air.

Safety and preparation

  • Work on a level surface with the engine off and key removed.
  • Wear eye protection and nitrile gloves. Brake fluid damages paint & plastics; protect the finish and immediately wipe spills with a damp rag.
  • Loosen any wheel lug nuts slightly and secure the ATV on stands if you need to remove wheels to access calipers.
  • Record the current brake pedal lever feel and travel so you can verify improvement.

Step-by-step procedure

1. Access & top up reservoir

  • Locate the brake fluid reservoir(s) — front master cylinder on the handlebar is common; rear reservoir may be separate or integrated. Clean the top of the reservoir before opening.
  • Remove the reservoir cap and diaphragm. Using a syringe or turkey baster, remove as much old fluid as practical from the reservoir to prevent contamination when adding new fluid.
  • Top the reservoir with fresh DOT 4 fluid to the fill mark. Keep the cap off during the bleeding process so you can monitor the level.

2. Identify bleed order

  • Bleed the brake caliper that is farthest from its master cylinder first, then move progressively closer. For single-master setups, common order is: far rear, near rear (or opposite rear), then front calipersadjust based on your machine’s line routing.
  • If there are separate front & rear masters, bleed each circuit independently following the far-to-near rule for that circuit.

3. Attach tubing & prepare catch bottle

  • Place a length of clear tubing over the bleeder nipple and submerge the other end in a small catch bottle partially filled with clean brake fluid to prevent air re-entry.
  • Crack the bleeder nut slightly so it is free but closed. Keep a wrench ready.

4. Bleeding techniques

  • Manual pump-and-hold method:
    • Have an assistant pump the brake lever/pedal several times and then hold firm.
    • Open the bleeder nipple about a 1/4 turn to allow fluid and air to escape into the tubing. Close the nipple before the assistant releases the lever to avoid sucking air back in.
    • Repeat until the fluid running out is clear and free of bubbles, topping the reservoir frequently.
  • Vacuum bleeder method:
    • Attach the vacuum pump to the bleeder nipple and draw until clear, monitoring the reservoir and topping as needed. This method is cleaner and can be done solo.
  • Pressure or gravity bleeding:
    • If using a pressure bleeder on the reservoir follow the bleeder manufacturer’s instructions; always monitor level and never over-pressurize the reservoir.

5. Work each caliper

  • Start at the farthest caliper and repeat the bleeding process until no air is visible in the tubing and the fluid is clean.
  • Move to the next caliper in the sequence and repeat.
  • When finished, firmly tighten bleeder nuts and wipe off excess fluid. Replace any crush washers if removed and ensure banjo bolts are secure.

6. Final reservoir fill & check

  • Top the reservoir to the correct level, reinstall the diaphragm and cap, and ensure it seats properly to avoid contamination.
  • Operate the brake lever/pedal several times for feel. If firmness is not achieved, repeat bleeding until solid feel is obtained.
  • Check for leaks at all fittings and along the hoses. Re-torque any fittings to factory spec if available in the service manual. If torque values aren’t at hand, snug securely but don’t over-torque; consider getting exact specs from MotoSport parts/support if needed.

Break-in test and final checks

  • Test the brakes at low speed in a safe area to confirm consistent bite and pedal feel. Perform a few controlled stops to bed the new fluid and ensure there is no sponginess.
  • Re-check fluid level after initial stop tests and top if necessary.
  • Properly dispose of old brake fluid according to local regulations.

Troubleshooting & tips

  • If the pedal remains spongy after several bleed cycles, inspect master cylinder seals, caliper pistons, and hoses for internal leakage or collapse. Swollen hoses can trap air and should be replaced.
  • Always use fresh DOT 4 fluid. Never reuse removed fluid or mix different fluid types.
  • Keep the reservoir cap on except when adding fluid; ambient moisture contaminates brake fluid quickly.
  • If you encounter stubborn air or suspect an internal master-cylinder issue, consider a full master-cylinder rebuild or replacement with OEM or MotoSport-recommended parts.

Maintenance frequency

  • Brake fluid should be replaced every 1-2 years depending on use and exposure to moisture. Heavy off-road or water-exposed use warrants more frequent changes.
  • Periodically inspect lines, fittings, pads, and rotors for wear as part of routine maintenance.

Related Shopping Categories

Shop Brake Fluid for a 2017 Kymco MXU 700i ATV.

Shop Brake Bleeders for a 2017 Kymco MXU 700i ATV.

Shop Brake Pads for a 2017 Kymco MXU 700i ATV.

Shop Brake Lines for a 2017 Kymco MXU 700i ATV.

Shop Brake Tools for a 2017 Kymco MXU 700i 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.