How to Bleed & Replace Brake Fluid on a 2020 Honda Rancher 420 4X4 DCT IRS (FA5)

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This MotoSport guide walks you through a complete brake fluid change and bleeding procedure tailored to the 2020 Honda Rancher 420 4X4 DCT IRS (model FA5). The procedure covers safety, recommended supplies, step-by-step bleeding options, tips specific to the Rancher’s layout, and maintenance notes owners need to know to keep brakes performing safely and reliably.

Important model notes for the 2020 Rancher 420 FA5

  • The Rancher 420 uses a hydraulic braking system with a handlebar front master cylinder and a rear master cylinder actuated by the foot pedal; it also has a cable parking/parking-brake mechanism. Treat the two circuits as separate when flushing if they are separate reservoirs.
  • The brake fluid reservoir(s) are translucent plastic on the handlebars (front) and near the frame/foot-brake master assembly (rear). Clean the caps and the surrounding area before opening to avoid contamination.
  • Avoid getting brake fluid on painted plastics or powder-coated surfaces – it’s corrosive to finishes. Wipe spills immediately with water and clean cloth.
  • Use only fresh, unopened brake fluid of the correct DOT rating for your Rancher as indicated in the owner’s manual; do not mix DOT types. If in doubt on DOT designation for your specific unit, use DOT 4 compatible fluid but confirm with your manual for service intervals.
  • Parking-brake cables on the Rancher can hide moisture & grit; inspect and lubricate the cable runs while bleeding brakes.

Tools & supplies

  • Fresh DOT-approved brake fluid (buy extra to fully flush both circuits)
  • Clear vinyl tubing to fit over bleeder nipples
  • Bleeder catch bottle or jar and a one-way valve adapter if available
  • Brake bleeder pump or vacuum pump OR a helper for manual pump-bleeding
  • Wrenches for bleeder nipples (typically 8mm or 10mm)
  • Phillips/flat screwdriver, rags, shop towels, gloves, safety glasses
  • Clean syringe or turkey baster for removing old fluid from reservoirs
  • Jack/blocks to lift vehicle for wheel access (if needed)

Safety precautions

  • Work on level ground with engine off and ignition key removed.
  • Wear gloves and eye protection. Brake fluid damages skin & paint.
  • Keep the master cylinder reservoirs capped when not actively adding fluid to prevent moisture absorption.
  • Dispose of old fluid per local regulations; do not pour down drains.

Pre-bleed preparation

  1. Park the ATV level and secure it. Remove any luggage racks or body panels that obstruct reservoir access.
  2. Clean the reservoir caps and surrounding area thoroughly.
  3. Open the reservoir(s) – note fluid level and color. Dark, contaminated fluid means a full flush is recommended.
  4. If very dirty, use a clean syringe to remove most old fluid from each reservoir before starting.
  5. Top reservoirs with fresh fluid to the fill mark, leave caps loosely on so air can escape while preventing contamination.

Bleeding strategy — general rule

Always start bleeding at the brake caliper furthest from the master cylinder and move toward the closest. For the Rancher this generally means: rear caliper (if isolated) first, then the front calipers, finishing at the caliper closest to its master cylinder. Maintain reservoir level above the minimum throughout.

Method A: Vacuum/hand pump bleeder (recommended for solo work)

  1. Attach clear tubing to the bleeder nipple and place the other end into a catch bottle partially filled with a little fresh fluid to prevent air ingestion.
  2. Use the vacuum pump on the nipple, have it pull until new fluid appears clear and bubble-free, then close the nipple while pump is holding vacuum. Tighten nipple to spec by feel but avoid overtightening.
  3. Open the reservoir, top with fresh fluid, then move to the next caliper according to the distance rule above.
  4. Repeat until the fluid exiting is clean and free of air bubbles. Keep reservoir level topped up during the entire process.
  5. After bleeding all wheels, pump the brake lever and pedal multiple times to confirm firm pressure. Recheck nipples for leaks and tighten if necessary. Replace reservoir caps.

Method B: Pressure bleeder (fast, clean, solo-friendly)

  1. Fill the pressure bleeder bottle with fresh DOT fluid and connect to the reservoir cap per the bleeder’s instructions.
  2. Pressurize the system to the bleeder manufacturer’s recommended psi (low pressure only). Open the farthest bleeder nipple and allow fluid to flow until clear, then close nipple.
  3. Proceed wheel-by-wheel toward the closest nipple. Keep pressure steady and reservoir topped.
  4. Depressurize, reinstall reservoir cap, pump brake lever/pedal to verify firmness.

Method C: Two-person pump-bleed

  1. Person A pumps brake lever/pedal several times and holds pressure. Person B opens bleeder nipple slightly until fluid flows without air. Close nipple while pressure is held. Repeat until clean fluid emerges.
  2. Top the reservoir as needed. Work from the furthest caliper to the nearest. Finish with firm lever/pedal feel and no sponginess.

Complete fluid replacement (full system flush)

  • To fully replace old fluid, continue bleeding each caliper until the fluid out of the bleed line is the same clear color as the fresh fluid. Routinely check and refill the master reservoir so it never runs low; the system will suck in air if it does.
  • If the reservoir contains float-style level sensors or separate chambers, service each according to layout to avoid mixing or starving a circuit.

After bleeding checks

  • Ensure all bleeder nipples are tightened and caps replaced where provided.
  • Check pedal and lever firmness at operating temperature (short test ride at low speed). Expect a firm, consistent feel & no sponginess.
  • Inspect for leaks, retainers, and hose condition. Replace hoses or seals that show damage or swelling.
  • Re-torque any fasteners you removed per Honda torque values in the service manual.

Troubleshooting

  • Persistent spongy pedal after bleeding: check for air trapped in ABS or hidden chambers, worn master cylinder seals, or leaking lines. A dedicated scan/bleed tool may be required if your unit has electronic components affecting the circuit.
  • If fluid looks milky: contamination with moisture or oil — perform another full flush and inspect rubber components.
  • Brake fade or persistent soft feel after new fluid: bed new fluid through light, controlled stops and confirm pads and rotors are within spec.

Maintenance intervals & owner tips

  • Brake fluid absorbs moisture over time – consider replacing fluid every 1-2 years depending on use and storage conditions, or sooner for machines ridden in wet/muddy conditions.
  • Check fluid color during routine service; dark or dirty fluid is a prompt to flush.
  • Inspect parking-brake cables and actuators during fluid service. Cables can corrode or stretch; lubricate pivot points and replace frayed cables.
  • Keep a small spare bottle of the correct DOT fluid in your shop for topping off during trailside maintenance, but never mix open bottles older than recommended shelf life.

Final notes

Bleeding and replacing brake fluid on the 2020 Honda Rancher 420 FA5 is straightforward with the proper tools and attention to keeping the reservoirs full and the system free of contamination. Use the bleeding order from the furthest caliper to the closest, protect painted surfaces from fluid, and confirm a firm pedal and lever before any ride. When in doubt about DOT rating or circuit layout, consult your Rancher service manual or a certified Honda technician before beginning.

Related Shopping Categories

Shop Brake Fluid for a 2020 Honda Rancher 420 4X4 DCT IRS (FA5) ATV.

Shop Brake Bleeders for a 2020 Honda Rancher 420 4X4 DCT IRS (FA5) ATV.

Shop Brake Pads for a 2020 Honda Rancher 420 4X4 DCT IRS (FA5) ATV.

Shop Brake Lines for a 2020 Honda Rancher 420 4X4 DCT IRS (FA5) ATV.

Shop Brake Tools for a 2020 Honda Rancher 420 4X4 DCT IRS (FA5) 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.