How to Bleed & Replace Brake Fluid on a 2009 Honda Rancher 420 4X4 ES POWER STEERING (FA2)

Shop parts for a 2009 Honda TRX420R4EP ATV.

This MotoSport proprietary guide covers safe, repeatable steps to drain, replace & bleed the brake system on the 2009 Honda Rancher 420 4X4 ES Power Steering (FA2). Follow every step carefully, use approved brake fluid, and observe safety precautions. This procedure is written for typical Rancher hydraulic brakes with the separate power steering system found on FA2 models.

What you need

  • Honda-approved DOT 3 brake fluid (sealed container)
  • Brake bleed kit: vacuum pump or clear tubing & catch bottle, or a pressure bleeder
  • Wrenches: commonly 8 mm or 10 mm for bleed nipples (verify size)
  • Socket set and floor jack or ATV stand to raise wheels safely
  • Clean rags, gloves, eye protection
  • Small turkey baster or fluid siphon (to remove old fluid from master reservoir)
  • Brake-clean aerosol or isopropyl alcohol to clean components
  • Torque wrench for fasteners if you remove calipers or hoses
  • Container for old fluid; dispose per local hazardous-waste rules

Model-specific notes for the 2009 Rancher 420 FA2

  • Power steering uses a separate reservoir and hydraulic system; do not introduce brake fluid into the power-steering reservoir.
  • The Rancher 420 commonly uses DOT 3 fluid. Always use fresh, sealed DOT 3 rated fluid and do not mix old and new or different types (DOT 3 vs DOT 4) unless specified by the fluid label; mixing changes boiling point and can harm seals.
  • Bleed order should start at the wheel farthest from the master cylinder. On most Rancher layouts that is: right rear, left rear, right front, left front. Confirm which brake lines on your unit tie back to the master cylinder if you modified lines or added accessories.
  • If your machine has aftermarket accessories or lifted suspension, routing or additional fittings can change bleed order and trap air; correct routing before bleeding.
  • The Rancher master cylinder reservoir is small & exposed; cover nearby painted surfaces to prevent brake fluid damage to plastics/paint.

Step-by-step: flush & replace brake fluid

1. Safety & preparation

  • Work on a level surface. Chock wheels and remove ignition key.
  • Raise the ATV or use stands so wheels are off the ground, allowing calipers to be accessed and wheels to turn freely.
  • Clean around the master cylinder cap and brake reservoir to prevent contamination when opening.
  • Wear gloves & eye protection; brake fluid is corrosive to paint and plastics.

2. Inspect system

  • Check lines, hoses, calipers & fittings for leaks or damage. Replace any cracked hoses or weeping fittings before bleeding.
  • Confirm bleed nipple sizes and locations. If a caliper or wheel cylinder is corroded you may need to replace it rather than attempt repeated bleeding.

3. Remove old fluid from reservoir

  • Open the master cylinder cap and diaphragm. Using a turkey baster or siphon, remove as much old fluid from the reservoir as possible without drawing air into the master cylinder inlet ports.
  • Refill reservoir with fresh DOT 3 fluid to the fill line. Keep the cap loosely installed to minimize contamination while allowing air to escape.

4. Bleed order & method

  • Follow the wheel order: farthest to nearest from the master cylinder (typical Rancher order: R rear, L rear, R front, L front).
  • Recommended methods: use a vacuum bleeder for one-person operation, a pressure bleeder for the reservoir, or a two-person pump-and-hold method using clear tubing to a catch bottle.

5. Bleeding procedure (vacuum or manual)

  • Attach clear tubing to bleed nipple and submerge the other end in a catch bottle partially filled with fresh fluid to avoid sucking air back in.
  • Have an assistant slowly depress the brake pedal several times and hold it down (or use the vacuum pump to pull fluid) while you open the bleed nipple ~1/4 turn. Old fluid and air will flow; close the nipple before the pedal is released. Repeat until fluid runs clear with no bubbles.
  • Keep the master reservoir topped up during the process to prevent air being drawn into the master cylinder. Never let the reservoir go below the minimum mark.
  • Work quickly to prevent contaminating the system with dirt or moisture.

6. Repeat for every wheel

  • Complete the same sequence for each wheel in the specified order. Refill the reservoir as needed.

7. Final flush (optional but recommended)

  • After primary bleed, perform a final flush by repeatedly drawing fresh fluid into the reservoir and bleeding until the fluid coming from each bleed nipple matches the fresh fluid color.

8. Close up & check

  • Tighten bleed nipples to the correct snugness; do not over-torque. If you removed calipers or hoses, torque fasteners to Honda specifications or a moderate snug setting if spec is unavailable; consult service manual if unsure.
  • Clean any spilled fluid from components immediately with brake cleaner and water to avoid paint/plastic damage.
  • Replace the master cylinder cap and diaphragm securely.

Testing & aftercare

  • With the ATV still supported, pump the brake pedal slowly until it feels firm and consistent. If it feels spongy, repeat bleeding steps; trapped air remains.
  • Lower the machine and perform a low-speed braking test in a safe area to confirm braking performance before riding normally.
  • Check for leaks after the first short ride and again after 24 hours of use.
  • Record the date and mileage/hours of fluid replacement in your maintenance log; brake fluid is hygroscopic and should be replaced every 1-2 years depending on use and moisture exposure.

Troubleshooting

  • Persistent spongy pedal after careful bleeding: inspect master cylinder for internal leakage, softened seals, or bypassing; consider replacing master cylinder.
  • If one wheel will not bleed clear: flush that caliper or wheel cylinder by removing it and bench-bleeding or replacing the component if corroded.
  • Contaminated fluid (dark with debris): perform a complete system flush and inspect for damaged seals or corroded metal that shed particles.

Disposal

  • Collect used brake fluid in a sealed container and dispose of it according to local hazardous-waste regulations. Do not pour down drains or onto the ground.

Following the steps above will restore brake performance and safety on your 2009 Honda Rancher 420 FA2. If you're unsure at any step or find damaged components, MotoSport recommends replacing worn parts with quality replacements and consulting a qualified technician for system repairs.

Related Shopping Categories

Shop Brake Fluid for a 2009 Honda TRX420R4EP ATV.

Shop Brake Bleeders for a 2009 Honda TRX420R4EP ATV.

Shop Brake Pads for a 2009 Honda TRX420R4EP ATV.

Shop Brake Lines for a 2009 Honda TRX420R4EP ATV.

Shop Brake Tools for a 2009 Honda TRX420R4EP 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.