How to Bleed and Replace Brake Fluid on a 2009 Honda TRX500 Rubicon 4X4
Shop parts for a 2009 Honda TRX500RUBI ATV.
This MotoSport guide walks you through draining, flushing, and bleeding the brake system on a 2009 Honda TRX500 Rubicon 4X4. Procedures below assume a stock, non-ABS hydraulic brake system as found on most 2009 Rubicon models. If your ATV is fitted with aftermarket brake components or an ABS module, consult a qualified technician before proceeding.
Tools & supplies
- Honda-recommended DOT 3 brake fluid (use fresh, unopened container)
- Brake bleeder kit (hand pump, vacuum pump, or clear tubing)
- Clean containers to catch old fluid
- Wrenches for bleeder nipples (typically 8mm)
- Screwdriver or socket for reservoir cap, shop rags, gloves and eye protection
- Jack or ramps and axle stands if needed for wheel access
- Torque wrench for caliper bolts if you remove them
Safety & prep
- Work on a level surface with the engine off and ignition key removed.
- Wear gloves & eye protection; brake fluid damages paint and plastics.
- Keep a clean, lint-free workspace to prevent contamination of the brake system.
- Check the owner’s manual for any model-specific cautions and the recommended fluid type; use only Honda-recommended DOT 3 fluid.
- If you plan to remove wheels or calipers, support the ATV securely on stands.
Overview of the system on the TRX500 Rubicon
The TRX500 Rubicon 4X4 uses a master cylinder with separate front & rear reservoirs or a split reservoir design feeding both circuits. For effective bleeding you’ll work from the wheel farthest from the master cylinder toward the closest wheel (typically rear-right, rear-left, front-right, front-left) unless the master cylinder layout dictates otherwise.
Step-by-step: Full fluid replacement and bleed
- Clean the reservoir cap area thoroughly to prevent dirt entering the system. Remove the cap and diaphragm; cover the opening with a clean rag to limit contamination.
- Note current fluid level. Siphon or absorb as much old fluid from the reservoir as possible with a turkey baster or brake fluid transfer syringe. Dispose of old fluid safely.
- Top up the reservoir with fresh DOT 3 fluid to the “MAX” mark. Keep the cap loosely in place to limit contaminants while allowing overflow.
- Start at the wheel farthest from the master cylinder. Have an assistant pump the brake pedal or lever several times and hold it down, or use a vacuum/pressure bleeder attached to the bleeder nipple with clear tubing leading to a catch bottle partially filled with clean fluid to prevent air re-entry.
- With the pedal held down, open the bleeder nipple about one-quarter to one-half turn. Allow old fluid and air to flow into the catch bottle until the flow slows, then close the nipple before the assistant releases the pedal. Repeat pump/open/close cycles until clear, bubble-free fluid flows.
- Monitor the master cylinder reservoir and keep it topped up during the entire procedure to prevent introducing air into the system.
- Repeat the process for the next-farthest wheel, working in sequence toward the master cylinder (usually rear-right, rear-left, front-right, front-left). For the TRX500 Rubicon, verify reservoir feed routing if unsure and adjust sequence accordingly.
- After bleeding all wheels, check pedal feel. It should be firm and not spongy. If spongy, repeat the bleeding cycle focusing on the circuit with poor feel or inspect for leaks.
- Inspect all hose fittings, banjo bolts, calipers, and bleeder nipples for leaks. Torque any fasteners you removed per Honda specs or to appropriate thread engagement torque; if unsure, tighten securely but avoid over-torquing.
- Clean any spilled brake fluid from painted surfaces immediately and replace the reservoir diaphragm & cap. Dispose of used fluid per local regulations.
- Test ride slowly to verify braking performance before normal operation.
One-person bleeding methods
- Use a vacuum bleeder on each caliper; attach the vacuum and open the bleeder while pumping the lever to maintain flow until clear fluid appears.
- Or use a one-way check valve hose or a pressure bleeder on the reservoir; follow the tool manufacturer’s instructions.
Troubleshooting
- Persistent spongy lever/pedal: check for air trapped in ABS modulator or master cylinder, soft hoses, or an internal master cylinder leak. Replace soft or swollen hoses.
- Low fluid level after bleeding: inspect for leaks at calipers, lines, fittings or the master cylinder.
- No fluid discharge when opening bleeder: ensure bleeder nipple is clear and not corroded; check for seized bleeder and apply penetrating oil carefully.
Model-specific notes for the 2009 TRX500 Rubicon 4X4
- Stock Rubicon models commonly use a conventional hydraulic system without factory ABS on most trims; confirm your ATV’s configuration before following ABS-specific procedures.
- The TRX500 uses a dual-circuit master cylinder design. Keep the reservoir topped up while bleeding each circuit to avoid cross-contamination and air entry.
- Brake lines and fittings on older Rubicons can show surface corrosion. Inspect the lines for cracks, swelling, or leaks and replace any suspect hoses to ensure safe braking.
- If you ride in wet or salty conditions, replace brake fluid every two years to prevent internal corrosion and loss of boiling point protection.
- After major brake service, double-check caliper pin condition and lubrication, and ensure parking brake/parking mechanism (if equipped) functions correctly.
Final checks
- Confirm the pedal/lever is firm at rest and during a slow test ride.
- Recheck all fasteners, bleed nipples, and the reservoir cap for tightness.
- Monitor fluid level over the next rides and re-inspect for any slow leaks.
Need replacement hoses, bleeder tools, or brake parts for your 2009 TRX500 Rubicon? Visit the MotoSport parts link above to get the correct components for your ATV.
Related Shopping Categories
Shop Brake Fluid for a 2009 Honda TRX500RUBI ATV.
Shop Brake Bleeders for a 2009 Honda TRX500RUBI ATV.
Shop Brake Pads for a 2009 Honda TRX500RUBI ATV.
Shop Brake Lines for a 2009 Honda TRX500RUBI ATV.
Shop Brake Tools for a 2009 Honda TRX500RUBI 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.
