How to Bleed and Replace Brake Fluid on a 2016 Kymco MXU 500i
Shop parts for a 2016 KYMCO MXU500i ATV.
Overview
This guide from MotoSport shows a practical, step-by-step method to drain, flush, and bleed the hydraulic brakes on a 2016 Kymco MXU 500i ATV. Follow all safety precautions, use the correct fluid, and work methodically to keep braking performance reliable.
What you need
- DOT 4 brake fluid (confirm with your owner's manual before purchase)
- Clear 3/16" or 1/4" plastic tubing that fits the bleeder nipple
- Brake fluid catch bottle or jar and clean disposable rags
- Rubber gloves, eye protection
- Shop towels & brake cleaner
- Wrench set (typically 8mm or 10mm for bleed nipples; confirm on your machine)
- Turkey baster or syringe (optional for master cylinder fluid removal)
- Assistant to operate the brake lever/pedal (or a one-person adapter kit)
Model-specific notes for the 2016 Kymco MXU 500i
- The MXU 500i commonly uses DOT 4 brake fluid; always verify the master cylinder cap or owner's manual before starting.
- Front and rear brakes are hydraulic – front calipers are typically two separate calipers; the rear uses a single caliper. Bleed sequence is front right, front left, then rear, unless the service manual specifies otherwise.
- The brake master cylinder reservoir on this model is small – keep it topped up during the procedure to avoid drawing air into the system.
- ABS is not commonly fitted to this MXU 500i model; if your machine has ABS or an electronic brake modulator, consult a dealer before bleeding to avoid damage.
- Brake hose routing and clip access on the MXU can be tight under the body panels – remove any obstructing plastic panels for better access.
Preparation
- Park the ATV on a level surface, engage parking brake or put in gear, and block wheels. Work in a well-ventilated area away from open flame.
- Clean the master cylinder cap area. Remove the cap and diaphragm carefully; cover the opening with clean plastic to prevent contamination if you need to step away.
- Inspect brake lines, hoses, and calipers for leaks, cracks, or damaged banjo fittings. Replace any suspect parts before bleeding.
- Lift the wheel(s) if needed so the calipers and bleeder nipples are accessible and the wheel can be rotated if necessary.
Drain/Flush then Bleed – recommended approach
Complete fluid replacement should combine a bulk drain/flush with a controlled bleed so new fluid fully replaces old fluid in calipers and the master cylinder.
- Start at the master cylinder: remove old fluid with a turkey baster or syringe until fluid level is low but some remains to avoid introducing air.
- Top the reservoir with fresh DOT 4 fluid to the MAX line.
- Locate the bleeder nipple on the caliper you will service first. Fit clear tubing over the nipple and submerge the other end in a small catch bottle partly filled with fresh fluid to prevent air being drawn back in.
- Have an assistant slowly depress and hold the brake lever/pedal while you open the bleeder nipple about a quarter to a half turn. Fluid and air will flow into the tube. Close the nipple before the assistant releases the lever. Repeat until fluid runs clear with no visible air bubbles, then tighten the nipple to spec (finger tight plus a small turn with a wrench &mdash do not over-torque).
- After each cycle, top the master cylinder to the correct level. Never let it drop to empty during the process.
- Repeat the process for the next caliper(s) following the sequence: front right, front left, rear (unless your MXU service manual directs a different order).
- Once all calipers show clear, bubble-free fluid, perform a final bleed pass on each caliper to be sure no trapped air remains.
One-person bleeding option
- Use a one-way valve kit or vacuum bleeder: attach the kit to the bleeder nipple and pull through the system until clear. These kits are handy when you don't have an assistant.
Final checks
- Clean any spilled fluid immediately & rinse painted surfaces with water &mdash DOT fluid damages paint and plastics.
- Confirm reservoir fluid level is at the proper mark and reinstall the cap & diaphragm securely.
- Pump the brake lever/pedal several times with the ATV on the ground and wheels installed to verify firm pedal feel. If the lever feels spongy, there may still be air in the system &mdash repeat bleeding.
- Inspect for leaks around bleeder nipples, banjo bolts, calipers, and master cylinder during a short test ride at low speed.
Torque & tightening tips
- Tighten bleed nipples snugly but avoid over-torquing. If the service manual gives a value, use it. For banjo bolts (caliper to hose), clean crush washers should be used and bolts torqued to the manual spec.
Maintenance interval & performance
- Brake fluid absorbs moisture over time. For reliability, replace brake fluid every 1-2 years depending on use and storage conditions, or sooner if the fluid looks dark or contaminated.
- If you ride in wet, muddy, or heavy-duty conditions common to MXU owners, inspect brakes more frequently and consider annual fluid changes.
Troubleshooting
- Persistent soft lever after bleeding: check for a leaking caliper piston seal, collapsed brake hose, or internal master cylinder issue.
- Visible contamination or dark fluid: perform a full drain and flush; contaminated fluid can damage internal components.
Safety reminders
- Never mix DOT 3, DOT 4, and DOT 5 silicone fluids. DOT 4 is hygroscopic – store sealed and dispose of old fluid properly.
- Brake fluid is corrosive to paint; protect surfaces and clean spills immediately.
- If you are uncomfortable with any step, have a professional technician complete the service.
Following these steps will restore the brake system on a 2016 Kymco MXU 500i to reliable function while keeping the procedure safe and proprietary to MotoSport's service standards.
Related Shopping Categories
Shop Brake Fluid for a 2016 KYMCO MXU500i ATV.
Shop Brake Bleeders for a 2016 KYMCO MXU500i ATV.
Shop Brake Pads for a 2016 KYMCO MXU500i ATV.
Shop Brake Lines for a 2016 KYMCO MXU500i ATV.
Shop Brake Tools for a 2016 KYMCO MXU500i 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.