How to Bleed and Replace Brake Fluid on a 2020 Honda TRX520 Rubicon 4X4 DCT EPS (FA6)
Shop parts for a 2020 Honda TRX520 Rubicon 4X4 DCT EPS (FA6) ATV.
This MotoSport guide walks you step-by-step through flushing and bleeding the brake system on a 2020 Honda TRX520 Rubicon 4X4 DCT EPS (FA6). Follow the procedures exactly, use recommended fluids and tools, and work safelybrakes are critical to safe operation.
Before you begin — model notes specific to the 2020 TRX520 Rubicon
- The TRX520 Rubicon DCT EPS uses a hydraulic braking system common to Honda ATVs; consult your owner's manual for the factory brake fluid specification. If the manual is not available, use DOT 4 brake fluid unless a different grade is specified by Honda.
- DCT refers to the dual-clutch transmission and EPS to electric power steering. EPS on this model is electric & does not use hydraulic fluid, so there is no EPS reservoir to worry about when changing brake fluid. DCT components are separate; keep brake fluid off any belts, clutch components or exposed transmission parts.
- Brake master cylinder and reservoirs are exposed near the handlebar/center of the machine; avoid spilling fluid on painted or plastic surfaces — brake fluid will damage finishes.
- This model typically has one master cylinder feeding the front & rear circuits; follow the bleed order for the circuit furthest from the master cylinder first (see sequence below).
Tools & supplies
- DOT 4 brake fluid (or type specified in your manual)
- Clear plastic tubing fitted to bleed nipples
- Catch bottle (brake fluid safe) with a small amount of fresh fluid to create a one-way trap
- Wrenches to fit bleed nipples (usually 8 mm or 10 mm)
- Turkey baster or syringe for removing old fluid from reservoir
- Cotton rags, brake cleaner for cleanup
- Masking tape and marker to note fluid level, and gloves/eye protection
- Optional: pressure bleeder or vacuum bleeder for a one-person job
Safety & preparation
- Work on a level surface with the ATV secure and the engine off. Use wheel chocks if needed.
- Wear nitrile gloves and eye protection. Keep brake fluid containers sealed and discard used fluid properly.
- Protect painted surfaces with rags or plastic where you expect drips. If fluid contacts paint, rinse immediately with water.
- Have a helper for manual pump-bleeding, or use a pressure/vacuum bleeder for a single-operator option.
Bleed sequence (general Honda ATV practice)
Bleed starting with the wheel/furthest caliper from the master cylinder and finish with the closest. Typical sequence for this model is:
- Rear passenger-side (right rear)
- Rear driver-side (left rear)
- Front passenger-side (right front)
- Front driver-side (left front)
Step-by-step procedure
- Remove the reservoir cap(s) and diaphragm. Clean around the cap to prevent contamination. Use a turkey baster to remove as much old fluid as possible from the reservoir. Refill with fresh brake fluid to the recommended level but do not overfill.
- Prepare each caliper bleed nipple: place clear tubing over the nipple and route into a catch bottle partially filled with fresh fluid to prevent air re-entry. Leave the reservoir cap loose but in place to avoid runoff while allowing air to escape.
- Start at the rear passenger-side caliper (furthest from the master cylinder). Have your helper slowly pump the brake lever/pedal several times and hold it down. Open the bleed nipple about a quarter-turn to let fluid and air escape into the tube. Close the nipple before the helper releases the lever/pedal. Repeat until clear, bubble-free fluid appears and no air comes out. Keep the reservoir topped off between cycles.
- Move to the rear driver-side caliper and repeat the pump-open-close cycles until fluid is clear and bubble-free, again maintaining the reservoir level.
- Proceed to the front passenger-side caliper and repeat the same process.
- Finish at the front driver-side caliper, repeating until the fluid is clear and the pedal/lever feels firm.
- If using a pressure bleeder, pressurize the master cylinder reservoir per the tool instructions, open each bleed nipple in sequence from furthest to nearest until fluid runs clear, then close and depressurize per tool guidance.
- After final bleed, top the reservoir to the correct mark, reinstall the diaphragm and cap, tighten bleed nipples to the specified torque (or snug them securely if torque spec is unavailable), and wipe away any spilled fluid.
- Test the brake lever and pedal for firm feel before riding. With the engine off, apply the brake repeatedly to verify no sponginess. If soft, repeat bleeding until firm. Perform a low-speed controlled stop test in a safe area to confirm proper operation.
Tips & troubleshooting
- Never let the reservoir run dry during bleeding — drawing air into the system will require repeating the entire process.
- If the system remains soft after thorough bleeding, inspect for leaks at calipers, hoses, master cylinder and banjo fittings. Replace worn seals or damaged hoses before finishing.
- If you encounter persistent air and there's a combination valve or internal brake switch, exercise the lever/pedal and allow the bike to rest upright so trapped air migrates to the reservoir.
- Use a vacuum or pressure bleeder for faster, cleaner results and to avoid the need for a helper.
Post-service maintenance and disposal
- Record the brake fluid change date and mileage in your maintenance log. Brake fluid is hygroscopic and should be replaced per Honda interval recommendations or if it appears dark or contaminated.
- Dispose of used brake fluid and contaminated rags at an approved hazardous-waste facility. Do not pour down drains.
- Inspect brake pads, rotors and hoses while you have the wheels off. Replace worn pads and address rotor damage promptly.
Final checks specific to the TRX520 Rubicon
- Electric power steering (EPS) on the Rubicon is electrically driven; no hydraulic bleed is required for EPS. Take care not to confuse an EPS unit or its connectors when working around the handlebars.
- The DCT transmission is wet-clutch equipped; avoid contaminating clutch components or oil with brake fluid. Keep brake work isolated and clean.
- Because many Rubicon owners use these machines in mud and water, check for water intrusion in brake components after off-road use. If water contamination is suspected, perform a full fluid flush sooner rather than later.
When in doubt, MotoSport recommends using OEM-spec fluids and parts and consulting your Honda TRX520 service manual for model-specific torque specs and fluid capacities. Properly bled brakes are essential for safe riding.
Related Shopping Categories
Shop Brake Fluid for a 2020 Honda TRX520 Rubicon 4X4 DCT EPS (FA6) ATV.
Shop Brake Bleeders for a 2020 Honda TRX520 Rubicon 4X4 DCT EPS (FA6) ATV.
Shop Brake Pads for a 2020 Honda TRX520 Rubicon 4X4 DCT EPS (FA6) ATV.
Shop Brake Lines for a 2020 Honda TRX520 Rubicon 4X4 DCT EPS (FA6) ATV.
Shop Brake Tools for a 2020 Honda TRX520 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.