How to bleed and replace brake fluid on a 2017 Honda Rancher 420 4X4 DCT IRS EPS (FA6) ATV

How to Bleed & Replace Brake Fluid on a 2017 Honda Rancher 420 4X4 DCT IRS EPS (FA6)

Shop parts for a 2017 Honda Rancher 420 4X4 DCT IRS EPS (FA6) ATV.

Overview

This guide from MotoSport explains how to safely flush and replace the brake fluid on your 2017 Honda Rancher 420 (FA6). It covers tools, supplies, safety notes specific to this MMY, and step-by-step bleeding procedures using either a bench/assistant or vacuum/pressure method. Follow the steps precisely to avoid air in the system and to protect brake components and nearby electrical systems like the EPS.

What you need

• Honda-approved brake fluid: DOT 3 or DOT 4 (use fresh, unopened container)
• Clear plastic tubing sized to the bleeder nipple
• Catch bottle for old fluid
• Brake bleeder kit (vacuum or pressure bleeder) or an assistant
• Wrenches to fit bleeder nipples (commonly 8 mm)
• Clean rags, gloves, eye protection
• Brake parts cleaner and small brush
• Torque wrench (for bleeder nipple/banjo bolts if removed)
• Jack and stands or ramps if wheel removal required

Model-specific notes for the 2017 Rancher 420 FA6

• The DCT (dual clutch transmission) and EPS (electric power steering) do not change brake fluid type or basic procedure, but avoid spilling brake fluid on electrical connectors, EPS harness, or painted plastics – DOT fluid is corrosive to paint and some plastics.
• Before bleeding, ensure the vehicle is parked on level ground with the engine off, transmission in Park (or neutral with parking brake engaged). If your Rancher has a service/parking brake configuration, lock the brake where noted in the owner manual to prevent rollback while working.
• Inspect brake lines, hoses, and calipers for age-related wear or cracks. FA6 machines used in heavy-duty or muddy service should have extra attention paid to hose clamps and caliper seals.
• If your unit has aftermarket parts fitted, verify compatibility with DOT 3/4 fluid and that bleeder nipple access isn't obstructed.

Safety first

• Do not allow brake fluid to contact painted surfaces, plastics, or rubber other than brake lines/parts. Wipe spills immediately and rinse with water if necessary.
• Wear gloves and safety glasses. Brake fluid is toxic and hygroscopic — keep the reservoir closed when not in use.
• Work on a cool machine; avoid a hot exhaust or hot brake components.

Procedure — Full fluid replacement (recommended)

Complete system flush replaces old fluid in both front and rear circuits. Do not mix DOT 3 and DOT 4; if you switch types, flush thoroughly then top with the chosen type.

1. Prepare

• Park the ATV level, set parking brake, turn key off, remove key.
• Clean the reservoir cap area thoroughly to keep contamination out. Remove the cap and diaphragm; cover opening with clean rag when not actively topping to limit moisture pickup.
• Use a turkey baster or fluid transfer pump to remove as much old fluid from the master cylinder reservoir as possible.
• Refill reservoir to the specified level with fresh brake fluid.

2. Identify bleed order

Always bleed the brake line furthest from the master cylinder first, working to the closest. Typical sequence: rear caliper (if most remote), then front calipers. On the Rancher, determine which caliper is highest/most remote from the master cylinder and start there. If unsure, bleed the passenger-side/front then driver-side/front then rear — ensuring you follow the specific routing on your machine if it differs.

3. Bleeding using an assistant (manual pedal/lever method)

• Attach clear tubing to the bleeder nipple, submerge the other end in a container partially filled with old fluid to see bubbles and prevent air from being drawn back.
• Have an assistant slowly pump the brake lever/pedal several times and then hold firm pressure.
• Open the bleeder nipple 1/4 to 1/2 turn with a wrench until fluid runs clear and bubble-free into the tube, then close the nipple while the lever/pedal is still held. Repeat until no air is visible and fluid is clear.
• Top up the reservoir frequently to prevent it running dry; keep it between min/max marks during the entire bleed operation.
• Work through the bleed sequence from furthest to nearest. After finishing all points, cycle the lever/pedal to confirm a firm feel.

4. Bleeding with a vacuum pump or pressure bleeder

• Attach the vacuum bleeder hose to the bleeder nipple and pump while a helper opens the nipple briefly, or connect a pressure bleeder to the master cylinder cap per tool instructions and pressurize the reservoir to the recommended value.
• Open each bleeder in sequence until clear, watching the reservoir level and topping as needed.
• Close each bleeder fully after air-free fluid exits. Depressurize tool before removing caps or hoses.

5. Final steps

• After bleeding all points, ensure bleeder nipples are tightened to spec (light torque: typically 8-12 ft-lbs — consult torque charts if available) and reinstall any removed wheels or components.
• Top reservoir to proper level, reinstall diaphragm and cap securely.
• Clean any spilled fluid from components and paintwork using appropriate cleaners and water rinse. Dispose of old fluid per local regulations.
• Test brake feel at low speed in a safe area before normal riding. Confirm no leaking, sponginess, or soft pedal/lever.

Troubleshooting & tips

• Persistent soft brake lever/ pedal after bleeding indicates remaining air, a leak, or a faulty master cylinder/caliper seal. Re-check all connections and seals.
• If the master cylinder reservoir level drops quickly during bleeding, inspect for leaks upstream or bleed points left open.
• Replace rubber hose lines showing cracking or swelling; these can draw air under pressure and reduce braking performance.
• When finished, verify parking brake operation (if equipped) and brake light switch function.

Maintenance interval & recommendation

MotoSport recommends flushing brake fluid every 1-2 years or sooner if the vehicle is used heavily, stored in humid climates, or shows spongy brakes. Fresh fluid maintains boiling point and corrosion protection for calipers and lines.

Final inspection

Before every ride after service, check for leaks, confirm brake feel, and verify that ABS (if fitted on aftermarket conversions) or brake sensors operate normally. If you detect persistent issues, have a qualified technician inspect the master cylinder, calipers, and line integrity.

Related Shopping Categories

Shop Brake Fluid for a 2017 Honda Rancher 420 4X4 DCT IRS EPS (FA6) ATV.

Shop Brake Bleeders for a 2017 Honda Rancher 420 4X4 DCT IRS EPS (FA6) ATV.

Shop Brake Pads for a 2017 Honda Rancher 420 4X4 DCT IRS EPS (FA6) ATV.

Shop Brake Lines for a 2017 Honda Rancher 420 4X4 DCT IRS EPS (FA6) ATV.

Shop Brake Tools for a 2017 Honda Rancher 420 4X4 DCT IRS 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.