How to Bleed and Replace Brake Fluid on a 2018 KYMCO MXU 700i

Shop parts for a 2018 KYMCO MXU 700i ATV.

This MotoSport guide walks you through safely flushing and bleeding the brake system on a 2018 KYMCO MXU 700i. Follow every step carefully & refer to your owner’s manual for any model-specific torque or safety data. Work on a cool ATV on a stable surface with the engine off unless otherwise noted.

What you’ll need

  • DOT 4 brake fluid (see owner’s manual to confirm)
  • Clear tubing to fit bleed nipples
  • Brake fluid catch bottle or container
  • Open-end wrenches sized for bleed nipples (typically 8mm or 10mm)
  • Turkey baster or fluid-syringe for removing old fluid from reservoir
  • Clean rags and isopropyl alcohol or brake cleaner for cleanup
  • Latex or nitrile gloves and eye protection
  • Torque wrench for reassembly where applicable

Safety precautions

  • Brake fluid damages paint & plastic – protect the ATV finish and rinse spills immediately with water.
  • Never mix brake fluid types. Use the type specified in the manual; most MXU 700i models use DOT 4.
  • Dispose of old fluid responsibly per local regulations.

Model notes for the 2018 KYMCO MXU 700i

  • The MXU 700i uses hydraulic brake calipers front & rear with bleed nipples accessible after removing small protective covers or wheel removal; inspect for dirt or road grime before opening the system.
  • The front master cylinder reservoir is mounted on the handlebar; the rear master cylinder is typically near the foot brake lever or under a body panel — locate both before starting.
  • This model does not commonly have ABS, so bleeding follows conventional procedures for each caliper/master cylinder circuit.
  • Brake hose routing on this ATV can be close to the engine & drivetrain; check hoses for chafe, cracks, or swelling while you work. Replace any suspect hose or fitting rather than bleeding only.
  • If the system shows foam in the reservoir or a spongy pedal/lever after bleeding, repeat the procedure and inspect for air ingress points or failed components (master cylinder seals, caliper pistons).

Step-by-step: Replace and bleed brake fluid

1. Prepare the ATV

  • Park on level ground & secure the ATV with the parking brake and wheel chocks.
  • Remove wheels or panels if needed for access to bleed nipples.
  • Clean the reservoir caps, master cylinders, and bleed nipples with brake cleaner to prevent contamination.

2. Remove old fluid from reservoirs

  • Remove reservoir caps — keep them upright to avoid dirt entry.
  • Use a turkey baster or syringe to extract most of the old fluid from each reservoir. Wipe the reservoir interior with a clean, lint-free cloth if heavily contaminated.
  • Top reservoirs with fresh DOT 4 fluid to the fill mark to avoid introducing air.

3. Bleeding order and general method

  • Bleed the farthest caliper from each master cylinder first. For the MXU 700i this often means: rear caliper(s) first, then front calipers, but verify routing on your machine.
  • Use a one-person gravity bleed for a simple refresh or a two-person method (pump-release) for a full bleed until no air appears. You can also use a syringe or vacuum pump attached to the bleed nipple.

4. Two-person pump-and-hold bleed (recommended)

  • Have an assistant slowly squeeze the brake lever or press the pedal several times and hold it firmly.
  • Open the bleed nipple one-quarter to one-half turn with the clear tubing attached to direct fluid into your catch container.
  • Old fluid and bubbles will flow out; close the nipple before your assistant releases the lever/pedal to prevent sucking air back in.
  • Repeat until the fluid runs clear with no bubbles, topping the reservoir as needed to keep it above the minimum level.
  • Torque the bleed nipple to specification if known, then wipe clean.

5. One-person gravity or syringe method

  • Attach clear tubing to the bleed nipple and route it to a container partially filled with fresh fluid to prevent drawing air back in.
  • Open the nipple and allow fluid to flow slowly until clear and bubble-free. Close the nipple before the reservoir approaches empty.
  • If using a syringe on the caliper bleed nipple, pull fluid out until clear then close the nipple while under slight vacuum.

6. Final checks

  • With all calipers bled, confirm lever/pedal feel is firm. If spongy, repeat bleeding cycles.
  • Top reservoirs to correct level, replace and tighten caps, clean any spilled fluid, and reassemble wheels/panels.
  • Inspect for leaks around bleed nipples, hoses, and fittings. Test ride slowly to confirm braking performance before regular use.

Troubleshooting & maintenance tips

  • If brakes remain soft after repeated bleeding, suspect a worn master cylinder or leaking caliper seals — replacing the faulty component is safer than repeated bleeding.
  • Always replace rubber hoses showing cracks or soft spots. Given the MXU 700i’s utility use, hoses can age faster under heavy exposure to mud and UV.
  • Change brake fluid every 1-2 years or sooner if contaminated; moisture absorption reduces boiling point and brake performance.
  • Keep brake parts clean and avoid using petroleum-based cleaners on rubber seals.

Performing a full fluid change and proper bleed will restore braking performance and prolong system life. If you encounter persistent issues or internal master cylinder/cylinder damage, consult a professional technician.

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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.