How to Bleed & Replace Brake Fluid on a 2020 Honda Rancher 420 4X4 DCT IRS EPS (FA6)

Shop parts for a 2020 Honda TRX420DCTIE ATV.

This MotoSport-exclusive guide walks you through safely draining, replacing, and bleeding the hydraulic brake system on the 2020 Honda Rancher 420 4X4 DCT IRS EPS (FA6). Follow each step carefully. If you're not comfortable working on brakes, have a qualified technician perform the work.

What you need

  • DOT 4 brake fluid (Honda-approved formula recommended)
  • Brake bleeder wrench set (common sizes 8mm & 10mm; verify on your machine)
  • Clear plastic tubing & catch bottle
  • Turkey baster or fluid transfer syringe
  • Clean rags, brake cleaner
  • Rubber gloves and eye protection
  • Jack, stands or ramps and wheel chocks
  • Optional: vacuum bleeder, pressure bleeder, or hand-held pump bleeder

Model-specific notes (what owners of the FA6 should know)

  • The DCT denotes the dual-clutch transmission; this does not change hydraulic brake layout, but avoid any fluid spills near transmission components and electrical connectors for the EPS.
  • IRS (independent rear suspension) provides independent caliper access but can mean tighter working space on some mounting bolts & bleeder screws.
  • EPS wiring and sensors are near front suspension; protect connectors and avoid soaking electrical components with brake fluid or cleaner.
  • Park the Rancher in PARK and set the mechanical parking brake before starting. Use wheel chocks for added safety.
  • Honda specifies DOT 4 for most recent Rancher models; do not use DOT 5 (silicone) and avoid mixing fluid types.

Preparation

  • Work on a level surface. Chock wheels and put the transmission in PARK. Remove wheels if needed for clear caliper access.
  • Clean the master cylinder reservoir cap & surrounding area to prevent contamination. Remove the cap and diaphragm slowly to minimize fluid splash.
  • Siphon old fluid from the reservoir with a turkey baster until most is removed; do not let the reservoir run dry during bleeding.
  • Top off with fresh DOT 4 fluid to the proper level do not overfill.

Recommended bleeding order

Use the farthest-to-closest approach relative to the master cylinder location. On the Rancher this typically means: rear calipers first, then front calipers. If your machine has a single rear master or combined front/rear layout, apply farthest-to-nearest logic. If unsure, identify the master cylinder and follow that sequence.

Bleeding methods

1) Manual (pump and hold)

  1. Have a helper sit on the machine and repeatedly pump the brake lever/pedal until firm, then hold pressure.
  2. Open the caliper bleeder screw 1/2 turn and allow fluid/air to exit into the clear hose into the catch bottle.
  3. Close the screw before your helper releases the lever/pedal. Repeat until clear, bubble-free fluid flows and lever/pedal feel is firm.
  4. Keep the reservoir topped between cycles to avoid introducing new air.

2) Vacuum or pressure bleeder (preferred for one-person jobs)

  1. Attach vacuum pump to bleeder nipple or a pressure bleeder to the reservoir per manufacturer instructions.
  2. Open bleeder and allow fluid to flow until no bubbles remain. Move through bleed order from farthest to nearest.
  3. Monitor reservoir level to prevent it running dry.

3) Gravity bleeding (slow, low-labour)

Open bleeder screws slightly and allow gravity to feed fresh fluid through. This is the slowest method but effective if you have time. Monitor reservoir carefully.

Step-by-step procedure

  1. Top reservoir with fresh DOT 4 fluid.
  2. Start with the caliper farthest from the master cylinder. Attach clear hose to bleeder and place other end in a catch bottle partially filled with fresh fluid to prevent air ingress.
  3. Use your chosen bleeding method and work until fluid leaving the bleeder is clear and free of bubbles.
  4. Close bleeder securely (hand-tight plus a small wrench snug; don't overtighten). Wipe away any spilled fluid immediately.
  5. Move to the next caliper (next-farthest) and repeat. Finish with the caliper nearest the master cylinder.
  6. Once all calipers are bled, pump lever/pedal to verify firm operation. Check reservoir level and top to the MAX mark, reinstall cap & diaphragm.
  7. Carefully clean any spilled fluid from painted surfaces; brake fluid will damage paint and plastics.
  8. Test brakes at low speed in a safe area before normal riding.

After service checks & tips

  • Inspect bleeder screws, hoses, and caliper seals for leaks. Torque caliper and wheel fasteners to factory specs if removed.
  • Record the bleed date and mileage for future maintenance. Brake fluid absorbs moisture over time — replace every 1-2 years or as recommended for heavy use.
  • If brake lever/pedal remains spongy after thorough bleeding, suspect a collapsed flex hose, internal caliper issue, or master cylinder problem. Further diagnosis or parts replacement may be required.
  • Dispose of contaminated brake fluid at an approved facility; do not pour down drains.

Common pitfalls

  • Letting the reservoir run dry during bleeding — this reintroduces air and requires repeating the process.
  • Using the wrong fluid type — DOT 5 is silicone-based and incompatible with DOT 4 systems.
  • Over-tightening bleeder screws or cross-threading caliper fittings. Tighten to snug and verify no leaks.
  • Not protecting EPS connectors or painted surfaces from fluid exposure.

Perform routine inspections of brake lines, calipers, pads and fluid condition. Keeping fluid fresh and free of air ensures consistent braking performance and safe operation of your Rancher 420. For parts and accessories tailored to this model, visit the MotoSport parts page above.

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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.