How to Bleed and Replace Brake Fluid on a 2017 Honda Rancher 420 4X4 DCT EPS (FA2)

Shop parts for a 2017 Honda Rancher 420 4X4 DCT EPS (FA2) ATV.

This MotoSport guide walks you through a safe, thorough brake fluid change and bleeding procedure for the 2017 Honda Rancher 420 4X4 DCT EPS (FA2). Follow every step, use the right tools and fluid, and observe the model-specific notes for reliable stopping performance.

What you need

  • DOT 4 brake fluid (Honda recommends DOT 4 for this platform)
  • Brake bleeder kit (vacuum or pressure bleeder) or clear tubing and a catch bottle
  • Wrenches for bleed nipples (usually 8 mm) and master cylinder reservoir cap
  • Clean rags, gloves, eye protection
  • Torque wrench for caliper/banjo bolts if you remove lines
  • Funnel or fluid transfer syringe
  • Brake parts cleaner
  • Jack and stands or ramps to raise wheels if you need access

Model-specific notes for the 2017 Rancher 420 (TRX420DCTE / FA2)

  • The Rancher 420 DCT has conventional hydraulic brakes with a front dual-disc setup and rear drum or sealed assembly depending on trimverify your specific unit before disassembly.
  • The DCT transmission and EPS systems are sensitive to contamination. Keep brake fluid away from painted surfaces and electrical connectors; brake fluid will damage paint and some plastics.
  • Some FA2 models have remote master cylinder locations and reservoir placements that require removing plastics or racks for clear access. Clear working space before starting.
  • If your ATV has been sitting, inspect brake hoses for cracking and banjo bolts for seepage; replace any suspect components when changing fluid.
  • Do not introduce petroleum-based cleaners into the brake system. Use only recommended DOT 4 fluid.

Safety first

  • Work on a level surface with the engine off and key removed.
  • Wear gloves and eye protection. Brake fluid is corrosive to paint and skin.
  • Never reuse brake fluid container contents. Opened DOT 4 absorbs moisture; use fresh sealed fluid.

Step-by-step: Replace & bleed brake fluid

1. Prepare the ATV

  • Park on level ground, engage park/gear, and block wheels.
  • If necessary, remove front plastic racks or panels to access the master cylinder reservoir and caliper bleed nipples.
  • Clean around the master cylinder cap to prevent dirt entering the system.

2. Drain the reservoir and add fresh fluid

  • Remove the master cylinder reservoir cap and diaphragm. Use a syringe or turkey baster to remove as much old fluid as possible from the reservoir.
  • Refill with fresh DOT 4 fluid to the full mark. Keep the reservoir cap off only when ready to bleed to avoid contamination.
  • Do not let the reservoir run dry during the procedure.

3. Choose a bleeding method

  • Vacuum or pressure bleeder: fastest and single-person friendly. Connect per kit instructions; follow manufacturer safety notes.
  • Two-person pump-and-open method: one person pumps the brake lever/pedal and holds pressure while the other opens the bleed nipple briefly, then closes it before the lever/pedal is released.
  • Gravity bleed: slow and less thoroughonly acceptable as a preliminary step before active bleeding.

4. Bleed sequence

Use the furthest caliper or wheel cylinder from the master cylinder first, then work toward the closest. For the Rancher 420 layout, a common sequence is:

  • Right front
  • Left front
  • Rear

Consult your machine to confirm plumbing if uncertain.

5. Bleeding procedure (vacuum or two-person)

  • Attach clear tubing to the bleed nipple and submerge the free end in a small bottle partially filled with fresh fluid to prevent air re-entry.
  • If vacuum bleeder: attach and draw fluid until clear, then close the bleed nipple before releasing vacuum.
  • If two-person: pump the lever/pedal slowly 6-10 times, hold pressure, open the bleed nipple until fluid runs clear and bubble-free, then close nipple before the lever/pedal is released. Repeat until no air appears and fluid is clean.
  • Keep reservoir topped off between steps to avoid sucking air into the master cylinder.

6. Repeat for all wheels

  • Move to the next wheel in sequence, repeating the bleeding steps until each line produces clear, bubble-free fluid.

7. Final checks

  • With all bleed nipples closed and tightened, ensure reservoir fluid is at correct level, reinstall diaphragm and cap securely.
  • Wipe any spilled fluid off paint or components immediately with water and a mild cleaner; brake fluid can damage finish.
  • Depress the brake lever and pedal several times to confirm firm, consistent feel. If spongy, recheck for air and bleed again.
  • Inspect for leaks at bleed nipples, banjo bolts and master cylinder. Torque banjo bolts and fasteners to Honda specs if removed.

When to replace hoses, calipers or master cylinder

  • Replace hoses with cracks, swelling, or any internal collapse signs. Soft, spongy pedal after proper bleeding can indicate hose deterioration.
  • Corroded or leaking calipers and banjo fittings should be replaced or rebuilt using OEM or high-quality parts.
  • If the master cylinder is leaking or the brake lever continually drops, rebuild or replace it.

Post-service ride checklist

  • Test brakes at low speed in a safe area before trail or road riding.
  • Double-check fluid level after a short test ride and re-torque any fittings if needed.
  • Monitor brake performance over the next few rides to ensure no air was trapped.

Notes & recommendations specific to MotoSport riders

  • Use fresh DOT 4 fluid purchased in a sealed container. Dispose of old fluid responsibly at a hazardous-waste facility.
  • When replacing lines or calipers, consider OEM or high-quality aftermarket parts listed on the MotoSport parts page for your TRX420DCTE model for proper fit and durability.
  • Keep a small bleed kit in your trail pack for emergency bench-bleeds if contamination or damage occurs while out riding.

Following this MotoSport guide will keep the 2017 Honda Rancher 420 DCT EPS braking system safe and responsive. If you encounter persistent sponginess, leaks, or unusual noises after bleeding, stop riding and have the system professionally inspected.

Related Shopping Categories

Shop Brake Fluid for a 2017 Honda Rancher 420 4X4 DCT EPS (FA2) ATV.

Shop Brake Bleeders for a 2017 Honda Rancher 420 4X4 DCT EPS (FA2) ATV.

Shop Brake Pads for a 2017 Honda Rancher 420 4X4 DCT EPS (FA2) ATV.

Shop Brake Lines for a 2017 Honda Rancher 420 4X4 DCT EPS (FA2) ATV.

Shop Brake Tools for a 2017 Honda Rancher 420 4X4 DCT EPS (FA2) 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.