How to Bleed and Replace Brake Fluid on a 2015 Honda TRX500 Rubicon 4X4 DCT EPS (FA6)
Shop parts for a 2015 Honda TRX500 Rubicon 4X4 DCT EPS (FA6) ATV.
This MotoSport guide walks you step-by-step through bleeding and replacing the brake fluid on a 2015 Honda TRX500 Rubicon 4X4 DCT EPS (Model code FA6). It is written specifically for owners of this MMY ATV and emphasizes safe practice, correct fluids, and model-specific notes so you can restore firm braking performance with confidence.
What you need
- Honda-approved brake fluid: DOT 3 or DOT 4 (use a fresh sealed container)
- Clear tubing sized to bleeder nipples and a catch bottle
- Wrench set (open-end or box for bleeder nipples)
- Socket set to remove wheels/guards if needed
- Brake bleeder pump or hand-held vacuum pump (or a helper for manual pump-and-hold)
- Clean rags, brake cleaner, and a small funnel
- Protective gloves & eye protection
- Torque wrench for reassembly
Important model notes for the TRX500 Rubicon 4X4 DCT EPS (FA6)
- The TRX500 Rubicon DCT uses an automatic DCT transmission and electric power steering; these systems are separate from the hydraulic brake circuits but may share mounting or routing spaces. Keep brake fluid away from electrical connectors and painted surfaces – it will damage paint and some plastics.
- There are separate master cylinder reservoirs for front and rear brake circuits on this platform. Identify each reservoir before starting so you don't cross-contaminate lines.
- Electronic components for EPS and DCT are sensitive to contamination and excessive vibration. When lifting or removing panels, disconnect battery negative if you will be working near harnesses or sensors for an extended period.
- Because the Rubicon is often used in wet/muddy conditions, inspect calipers, lines, and bleeder nipples for corrosion or debris prior to bleeding. Replace any damaged rubber lines or seized nipples to ensure a reliable bleed.
Preparation
- Park on a level surface, set the parking brake, and block the wheels. If you'll remove wheels to access calipers, use jack stands or ramps and follow safe lifting procedures.
- Clean around master cylinder reservoirs and bleeder nipples to prevent contamination. Remove reservoir caps and diaphragms carefully. Top reservoirs with fresh brake fluid so fluid level is visible but not overfilled.
- Identify which reservoir feeds which caliper(s). On many ATVs the front and rear systems are separate; consult your owner's manual for exact routing if unsure. Keep the correct reservoir topped throughout the procedure.
- If the system is very contaminated, plan to fully flush both circuits by repeatedly topping with fresh fluid and bleeding until clear fluid emerges.
Bleeding order
Bleed starting at the caliper farthest from its master cylinder and work toward the closest. Typical sequence:
- Rear caliper(s) first (if the rear master feeds the rear caliper), then front calipers, finishing with the caliper nearest the front master.
- If front master feeds both front calipers, the usual order is the opposite front wheel furthest from the master, then the nearest.
Step-by-step bleed (single caliper using vacuum or manual pump)
- Attach clear tubing to the bleeder nipple and submerge the other end in a catch bottle partially filled with fresh brake fluid to avoid drawing air back in.
- Have an assistant slowly depress the brake pedal several times then hold it down (or use a pressure/ vacuum bleeder according to tool instructions).
- Open the bleeder nipple about a 1/4 turn while the pedal is held down; fluid and air will flow into the tubing. Close the nipple before the assistant releases the pedal. Repeat until you see clean, bubble-free fluid.
- Keep the reservoir topped between cycles to prevent sucking air into the master. Refill with fresh fluid as needed.
- Move to the next caliper in the bleed order and repeat. When finished, fill reservoirs to the proper level and reinstall diaphragms and caps.
- With the engine off, press the brakes several times to build pedal firmness. If pedal feels spongy, repeat bleeding steps until firm.
If using a vacuum bleeder or pressure bleeder
Follow the manufacturer instructions for the device. When using a pressure bleeder on the reservoir, keep pressure moderate — do not exceed safe limits and monitor the reservoir level so it never runs dry. Vacuum tools speed the process but still require the correct bleed sequence and topped reservoirs.
Flushing the entire system
To fully replace old fluid: bleed each circuit until new fluid runs clear and shows the same color/clarity as the fresh fluid. Replace fluid in both master reservoirs as you go. Dispose of used brake fluid responsibly – it is hazardous waste.
Post-bleed checks
- Torque bleeder nipples and any wheel or caliper bolts to factory specs where applicable.
- Inspect for leaks around calipers, lines, and reservoirs with the system pressurized (press the brake pedal firmly several times with the vehicle stationary).
- Test ride at low speed in a safe area to confirm brake performance. Check pedal firmness and stopping behavior.
- Recheck fluid levels after the first short ride; top if necessary.
Safety & common troubleshooting
- Never mix DOT 3/4 with DOT 5 (silicone). DOT 5 is not recommended for this ATV's hydraulic system.
- Keep brake fluid off paint, plastics, and battery terminals. Wipe any spills immediately and rinse with water if needed.
- If a caliper nipple is rounded or seized, replace it before bleeding. Replacing corroded lines or caliper hardware is cheap insurance against brake failure.
- Persistent spongy pedal after correct bleeding can indicate a collapsed flexible hose, a faulty master cylinder, or internal caliper issue – inspect and replace components as needed.
Recommended service interval and notes
For the TRX500 Rubicon DCT, replace brake fluid every 2 years or sooner if the fluid becomes dark or contaminated, especially after heavy mud/water use. Regular inspection of lines, calipers, and bleeder screws is recommended because off-road exposure accelerates corrosion.
Perform bleeding and fluid replacement with fresh sealed DOT 3 or DOT 4 fluid, protect electrical components for the DCT & EPS, and take extra care not to introduce dirt into the reservoirs. If you encounter internal master cylinder or caliper failure, use OEM or high-quality replacement parts to maintain reliable braking.
Related Shopping Categories
Shop Brake Fluid for a 2015 Honda TRX500 Rubicon 4X4 DCT EPS (FA6) ATV.
Shop Brake Bleeders for a 2015 Honda TRX500 Rubicon 4X4 DCT EPS (FA6) ATV.
Shop Brake Pads for a 2015 Honda TRX500 Rubicon 4X4 DCT EPS (FA6) ATV.
Shop Brake Lines for a 2015 Honda TRX500 Rubicon 4X4 DCT EPS (FA6) ATV.
Shop Brake Tools for a 2015 Honda TRX500 Rubicon 4X4 DCT EPS (FA6) 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.
