How to Bleed & Replace Brake Fluid on a 2015 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6)
Shop parts for a 2015 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6) ATV.
This MotoSport-exclusive service guide walks you through safely draining, flushing, and bleeding the entire brake system on the 2015 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6). Instructions are written for a competent DIYer with basic tools. Follow all safety precautions and wear eye protection and gloves.
Model notes & important reminders
- The TRX500R_PS uses a hydraulic braking system with separate front and rear calipers; it is not an ABS unit. The machine uses DOT 4 brake fluid. Never use DOT 5 (silicone) fluid or mix fluid types.
- Power steering on this model is independent of the brakes, but take care to prevent brake fluid contamination of power steering components, painted surfaces, plastic, and rubber. Brake fluid will damage paint & some plastics.
- Brake master cylinders and reservoirs are small – do not let reservoirs run dry while bleeding or you will introduce air and extend service time.
- Bleeding sequence follows farthest-to-nearest from the master cylinder: rear caliper, then the front calipers (typically right/front passenger side then left/front driver side). Adjust if your machine has a different layout; the goal is to move air toward the master cylinder.
Tools & materials
- DOT 4 brake fluid (new, unopened)
- Brake bleeding kit: clear hose, catch bottle, or a hand-held vacuum bleeder or pressure bleeder
- Fresh rags, screwdriver set, wrench set (bleeder wrench preferred), small pliers
- Turkey baster or syringe (to remove old fluid from reservoirs)
- Brake cleaner, shop towels, disposable gloves, safety glasses
- Container for used fluid for proper disposal
- Service manual or torque specs if you plan to remove wheels/calipers
Preparation
- Park on level ground, choke off ignition, set parking brake, and remove the key.
- Clean around each master cylinder reservoir cap and the caliper bleeder screws to avoid contamination entering the system.
- Locate reservoirs: there is a front master cylinder at the handlebars and a rear master cylinder near the foot brake area. Ensure you can access both reservoirs easily.
- If the fluid is very dark or contains debris, plan to completely drain & refill both front and rear circuits. If only minor discoloration, you can flush each circuit until fluid runs clear.
Step-by-step procedure – full fluid replacement and bleed
- Remove cap(s) from the master cylinder reservoir(s). Use a clean rag to cover the opening to prevent dirt entry.
- Siphon out as much old fluid from the reservoirs as possible using a turkey baster or syringe. Dispose of removed fluid properly.
- Refill the reservoirs with fresh DOT 4 fluid to the specified level. Do not overfill.
- Attach a clear hose to the rear caliper bleeder screw. Submerge the other end in a small clear jar partially filled with clean brake fluid to prevent air from re-entering the line.
- Have an assistant slowly depress the brake pedal (or lever for front) several times and hold it down. Open the bleeder screw slightly to allow fluid & air to escape. Close the screw, then have the assistant release the pedal. Repeat until clear fluid without bubbles exits. Keep the reservoir topped up during the process.
- Repeat the procedure for the next farthest caliper (typically front right), then the next (front left). Always maintain fluid level in the master cylinder to prevent air entry.
- If using a vacuum or pressure bleeder, follow device instructions but maintain the same caliper sequence. Pressure tools speed the process and often require only one person.
- After bleeding all calipers, pump the brake pedal/lever to confirm firm, consistent pressure and travel. If the pedal is spongy, repeat bleeding until firm.
- Top off reservoirs to the correct level, secure caps, and wipe any spilled fluid from painted or plastic parts immediately and rinse if needed.
- Torque bleeder screws and any caliper fasteners to factory specifications if removed. If you don't have torque specs on hand, snug hardware to avoid stripping & avoid over-tightening.
Partial flush for routine maintenance
If your fluid is only moderately discolored, you can perform a partial flush: remove old fluid from reservoirs, refill with fresh DOT 4, then bleed each caliper until the output runs clear. Repeat until fluid in reservoirs remains clear after bleeding.
Testing & final checks
- With the vehicle still supported, press the brake pedal repeatedly to verify firmness and check for leaks at lines, calipers, and bleeder screws.
- Test brakes at low speed in a safe area before returning to normal use. Check pedal feel after a short ride and re-inspect for leaks and fluid level.
- Record service date & mileage. Honda recommends replacing brake fluid at regular intervals; consult your owner manual for schedule and use DOT 4 only.
Safety & disposal
- Brake fluid is hazardous. Dispose of used fluid at an approved recycling or hazardous waste facility.
- If brake fluid contacts skin or eyes, flush immediately with water and seek medical attention for eyes. If it contacts paint, rinse immediately to reduce damage.
Common issues & troubleshooting
- Persistent spongy pedal after bleeding usually means air remains in the system; repeat bleeding sequence, keeping reservoirs topped up.
- Leaking bleeder screw or caliper fitting requires replacement hardware or caliper seal service. Do not operate the vehicle with a leaking brake system.
- If you removed calipers or lines, ensure correct routing and secure fasteners before testing brakes.
Following this MotoSport-specific guide will ensure a safe, thorough brake fluid change and bleed on your 2015 Honda TRX500 Rubicon 4X4 POWER STEERING. If you prefer professional assistance, or need OEM pads, hoses, or replacement components, visit our parts page linked above for parts matched to your MMY.
Related Shopping Categories
Shop Brake Fluid for a 2015 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6) ATV.
Shop Brake Bleeders for a 2015 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6) ATV.
Shop Brake Pads for a 2015 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6) ATV.
Shop Brake Lines for a 2015 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6) ATV.
Shop Brake Tools for a 2015 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.