How to Bleed and Replace Brake Fluid on a 2016 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6)
Shop parts for a 2016 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6) ATV.
This MotoSport procedural guide walks you through safe, correct brake fluid replacement and bleeding for the 2016 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6). Follow the steps exactly, use recommended fluid, and observe all safety precautions.
What you need
- Honda DOT 3 or DOT 4 brake fluid (check owner manual for factory spec) – fresh, unopened bottle
- Brake bleeder kit with clear tubing and catch bottle or vacuum bleeder
- Wrenches: 8mm and 10mm (or sizes matching bleeder and reservoir cap)
- Turkey baster or fluid syringe
- Clean rags, shop towels, and nitrile gloves
- Brake cleaner and a small container for old fluid
- Jack stands or ramps; blocks for wheel chocks
- Torque wrench for caliper hardware (recommended values per manual)
Safety first
- Work on a level surface with the engine off and key removed.
- Wear eye protection and gloves; brake fluid damages paint & plastic.
- Keep fresh fluid sealed – DOT fluid absorbs moisture quickly.
- Dispose of used fluid according to local regulations.
Model notes specific to the TRX500 Rubicon FM6
- Power steering model has identical hydraulic brake components to non-PS Rubicons; brake reservoir is on the right front fender area near the master cylinder.
- ABS is not fitted on this ATV – bleeding is straightforward single-line caliper style.
- Front dual-caliper setup and single rear caliper require bleeding each caliper individually; front calipers will bleed left and right separately from the master cylinder.
- Use care when working near power steering hoses – do not mix brake fluid with PS fluid and avoid contaminating PS components.
- If brake pedal feels spongy after bleeding, repeat the sequence; persistent sponginess may indicate master cylinder or caliper seal issues requiring service.
Preparation
- Park ATV on level ground; block rear wheels and place in park/neutral with parking brake applied if equipped.
- Remove plastic parts necessary to access the brake fluid reservoir and caliper bleeder screws (right front fender panel on many units).
- Clean the reservoir cap area to prevent contamination. Remove cap and diaphragm, leaving them exposed just enough to monitor fluid level.
- Use a turkey baster to remove most old fluid from the reservoir; do not let the master cylinder run dry.
- Refill reservoir with fresh DOT 3 or DOT 4 to the max line but leave cap off during bleeding to watch for air release.
Bleeding order
Follow this order: right front, left front, then rear. This helps draw air efficiently from the master cylinder to the furthest caliper last.
Manual (two-person) bleeding method
- Attach clear tubing to the bleeder nipple of the caliper you are bleeding; submerge the other end in a small container partially filled with fresh brake fluid to prevent air re-entry.
- Have an assistant pump the brake pedal 3–5 times and hold firm at the end of the stroke.
- Open the bleeder screw about a quarter turn; fluid and air will flow into the tubing. Close the bleeder before your assistant releases the pedal.
- Repeat pump, hold, open, close cycles until the fluid runs clear with no air bubbles and pedal feels firm. Keep reservoir topped off between cycles to avoid drawing air into the master cylinder.
- Perform the same procedure on the next caliper in the sequence (right front → left front → rear).
- After final caliper, top the reservoir to the max line, reinstall diaphragm and cap, clean any spilled fluid, and test brake pedal firmness with ATV stationary.
Vacuum bleeder method (single-person)
- Connect vacuum pump to bleeder nipple using clear tubing; place other end into catch container.
- Apply a steady vacuum and open the bleeder; allow fluid and air to draw out until clear, keeping reservoir topped off.
- Close bleeder, release vacuum, and move to the next caliper in the sequence.
- Finish by topping off reservoir, reinstalling cap, and cleaning up.
Post-bleed checks
- With engine off, apply firm pressure to brake pedal – it should be solid and not sink slowly.
- Start engine and recheck pedal feel; a small change is acceptable but pedal must remain firm.
- Inspect all fittings and lines for leaks; torque bleeder screws and caliper bolts to spec if removed.
- Test ride at low speed in a safe area to confirm braking performance before returning to regular use.
Common problems & troubleshooting
- Persistent spongy pedal: repeat bleeding sequence, ensure reservoir never ran dry, inspect master cylinder seals and caliper pistons for leaks.
- Air returns after a short ride: check bleeder screw threads and line fittings for tightness and sealing; inspect brake lines for cracks or damage.
- Contaminated fluid (dark, foamy): flush completely and replace with fresh DOT-rated fluid; consider caliper overhaul if contamination entered caliper internals.
Maintenance tips & intervals
- Replace brake fluid every 1–2 years depending on use and environment; frequent wet conditions or heavy-use riding suggests annual replacement.
- Inspect hoses, fittings, and caliper boots at each oil change; replace any brittle or damaged components promptly.
- Keep a sealed spare bottle of DOT fluid in your shop – moisture contamination reduces service life once opened.
Final notes specific to your TRX500R_PS
- OEM replacement parts for lines, bleeder screws, and reservoir components are available — using correct-fit parts avoids leaks and simplifies bleeding.
- If your TRX500 exhibits progressive brake fade under load, check rotor condition and pad thickness — replacing pads and machining or replacing rotors may be required.
- When in doubt about master cylinder condition or persistent braking issues, consult a qualified ATV technician to avoid safety risks.
Related Shopping Categories
Shop Brake Fluid for a 2016 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6) ATV.
Shop Brake Bleeders for a 2016 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6) ATV.
Shop Brake Pads for a 2016 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6) ATV.
Shop Brake Lines for a 2016 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6) ATV.
Shop Brake Tools for a 2016 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6) 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.