How to Bleed & Replace Brake Fluid on a 2018 Honda TRX250 Recon

Shop parts for a 2018 Honda TRX250REC ATV.

This MotoSport guide walks you through a safe, complete brake fluid replacement and bleed on the 2018 Honda TRX250 Recon (TRX250REC). Follow these steps carefully to restore firm pedal/lever feel, keep seals & components healthy, and avoid contamination. Work in a clean, well-lit area and dispose of old fluid responsibly.

What you need

  • Honda-recommended brake fluid: DOT 3 (fresh, unopened)
  • Clear plastic hose (inner diameter to fit bleed nipple)
  • Small catch bottle or jar
  • Brake bleeder pump or hand-tight syringe (optional)
  • Assistant to operate brake lever/pedal
  • Clean rags, disposable gloves, safety glasses
  • Wrenches: commonly 8mm or 10mm for bleed nipples (verify on your bike)
  • Torque wrench for caliper/banjo bolts if you remove components
  • Philips/flat screwdriver to open reservoir & pry dust caps

Precautions specific to the TRX250 Recon

  • Use only DOT 3 fluid. Mixing fluid types or using contaminated fluid will damage rubber components and master cylinders.
  • The Recon uses a simple master cylinder setup; don’t overfill the reservoir to avoid spills and paint damage.
  • Protect painted surfaces and plastic by covering with rags when working near the reservoir and calipers.
  • If the bike has drum brakes (some Recon trims), the procedure still requires fresh fluid to the wheel cylinder via the master cylinder bleed system; drum brake components may need inspection for shoes/cylinders.
  • If ABS or electrical sensors are present on an aftermarket setup, take care not to depress sensors or damage wiring when working on calipers or lines.

Preparation

  • Park the ATV on level ground, secure with parking brake and/or blocks, and remove ignition key.
  • Clean the reservoir cap area thoroughly to prevent dirt from falling in when opened.
  • Inspect brake lines for cracks, swelling, or leaks. Replace any damaged lines before bleeding.
  • Raise wheels if needed so calipers or drums can operate freely. Use jack stands rated for ATVs.

Step-by-step: Replace brake fluid & bleed

  1. Remove the reservoir cap and diaphragm. Siphon out most of the old fluid with a syringe or absorbent rag so fresh fluid won’t be immediately diluted. Do not let dust or moisture enter.
  2. Refill reservoir with fresh DOT 3 to the full mark. Keep the cap loosely in place to reduce exposure to air while working.
  3. Start with the brake circuit furthest from the master cylinder. On most TRX250 installations that is the rear or the passenger-side caliper/drum's bleed nipple; consult the bike layout to confirm order: farthest wheel first, then next, finishing with the nearest wheel.
  4. Fit clear hose over the bleed nipple and submerge the other end partially in a catch bottle containing some fresh fluid (prevents air from reentering the system).
  5. Have your assistant slowly squeeze the brake lever or press the pedal several times and then hold pressure.
  6. With pressure held, open the bleed nipple about a quarter turn to allow fluid and air to flow into the hose. Close the nipple before the assistant releases the lever/pedal. Repeat until clear, bubble-free fluid exits and no air is seen in the hose.
  7. Keep the reservoir topped with fresh fluid during the process. Never allow the reservoir to run dry or air will be drawn into the system.
  8. When the circuit is free of air, tighten the bleed nipple to spec (snug; typical small nipples are hand-tight plus a quarter turnuse common sense and a torque wrench where specified) and wipe away any spilled fluid immediately.
  9. Repeat steps 3-8 for each wheel in sequence, finishing with the circuit closest to the master cylinder.
  10. Once all circuits are bled, verify a firm pedal/lever feel by operating the brakes multiple times. If the lever is spongy, repeat bleeding until firm.
  11. Clean the reservoir cap area, reinstall the diaphragm and cap, and secure any dust caps on bleed nipples.
  12. Lower the ATV, torque any removed bolts/banjo fittings to factory spec if you removed them (consult your service manual for exact torques), and make a short low-speed test ride in a safe area to confirm braking performance.

Common issues & troubleshooting

  • Spongy lever after bleeding: likely air still present. Re-bleed entire circuit, ensuring reservoir never runs dry.
  • Brake drag after bleeding: check caliper slide pins, pad alignment, and that pistons returned fully. Excess fluid or swollen hoses can also cause drag.
  • Leaking at banjo bolts or bleed nipples: inspect crush washers and replace if necessary; torque to spec.
  • Soft brake pedal under load: inspect master cylinder seals and wheel cylinders/calipers for internal leaks; replace worn parts.

Maintenance tips for the 2018 TRX250 Recon owner

  • Replace brake fluid every 2 years or sooner if contaminated; moisture absorption reduces boiling point and can cause fade in heavy use.
  • Inspect brake lines annually for cracks or soft spots; replace if aged or damaged.
  • Keep an eye on pad/drum wear. The Recon is a utilitarian ATV so usage cycle affects wear rate significantly.
  • Store brake fluid sealed & upright; don’t reuse fluid drained from the system.
  • If you plan towing or heavy loads, perform brake inspection and fluid refresh beforehand to ensure optimal performance.

Final checks

  • Confirm no fluid leaks, firm braking, and correct pedal/lever travel.
  • Double-check that paint & plastics are clean of brake fluid; wash affected areas quickly with water.
  • Document the service date and fluid used for your maintenance records.

Following this MotoSport proprietary procedure will keep your 2018 Honda TRX250 Recon braking reliably and safely. If uncertain about any step, consult a qualified technician or reach out to MotoSport for parts and support.

Related Shopping Categories

Shop Brake Fluid for a 2018 Honda TRX250REC ATV.

Shop Brake Bleeders for a 2018 Honda TRX250REC ATV.

Shop Brake Pads for a 2018 Honda TRX250REC ATV.

Shop Brake Lines for a 2018 Honda TRX250REC ATV.

Shop Brake Tools for a 2018 Honda TRX250REC 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.