How to Bleed & Replace Brake Fluid on a 2016 Honda Rancher 420 4X4 POWER STEERING (FM2)

Shop parts for a 2016 Honda Rancher 420 4X4 POWER STEERING (FM2) ATV.

This MotoSport-exclusive step-by-step guide covers flushing and bleeding the brake systems on the 2016 Honda Rancher 420 4X4 POWER STEERING (FM2). Follow these instructions carefully to keep braking performance crisp and safe. Read the entire procedure before beginning.

What to know about the 2016 Rancher 420 4X4 POWER STEERING (FM2)

  • The Rancher 420 uses separate front and rear brake circuits: a handlebar lever master cylinder for the front and a foot-operated pedal master cylinder for the rear. Bleed and service each circuit individually.
  • Use the brake fluid type specified by Honda for this model. The reservoir cap or owner’s manual will list DOT fluid compatibility (DOT 3 or DOT 4). Do not mix DOT brake fluid with other fluids.
  • Power steering on this model is a separate hydraulic system — do not confuse power steering fluid with brake fluid.
  • Brake lines, calipers, and fittings on the Rancher are accessible but can be contaminated by dirt & debris. Clean around caps and bleeder valves before opening to avoid introducing contaminants.
  • There is no factory ABS on this ATV model; bleeding is a manual hydraulic process only.

Tools & Supplies

  • Clean DOT-specified brake fluid (per Honda recommendation)
  • Clear plastic tubing to fit bleeder nipple
  • Catch bottle for old fluid
  • Wrenches for bleeder nipples (use correct size)
  • Phillips/flat screwdriver and rags
  • Brake bleeder pump or vacuum bleeder (recommended) or an assistant for manual pedal/lever pumping
  • Gloves, eye protection, and a small funnel
  • Jack or ramps and stands to safely lift and support ATV if needed

Safety & Preparation

  • Park ATV on a level surface, engine off, parking brake engaged, and key removed.
  • Clean around the master cylinder reservoir cap before opening. Brake fluid is corrosive to paint & plastics; protect bodywork and rinse spills immediately.
  • Keep old fluid sealed and dispose of it at an approved recycling center.
  • Work one circuit at a time to avoid mixing systems or allowing reservoirs to run dry.

Procedure Overview

Do a full fluid replacement by flushing old fluid and bleeding each caliper until new fluid runs clear and no air remains. Start with the circuit furthest from its master cylinder; for separate front/rear masters, treat each circuit independently.

Step-by-Step: Front Brake Circuit (Handlebar Lever Master)

  1. Remove reservoir cap and diaphragm. Clean the area and top up with fresh DOT fluid to the full mark.
  2. Locate the caliper bleeder nipple(s). Place a clear tube over the nipple and route into a catch bottle partially filled with old fluid to prevent air re-entry.
  3. Loosen the bleeder nipple about 1/4 to 1/2 turn. Do not fully remove.
  4. With an assistant gently pull the front brake lever several times and hold it compressed. While held, open the bleeder to allow fluid/air out, then close the bleeder before the lever is released. Repeat until clear, bubble-free fluid appears.
  5. If using a vacuum or pressure bleeder, attach the tool to the reservoir or bleeder nipple per tool instructions and draw fluid until clear lines flow from the caliper. Keep the reservoir topped up during the entire process.
  6. Tighten the bleeder to a snug fit. Check reservoir level and top to the fill mark. Replace diaphragm and cap.
  7. Test lever firmness. If spongy, repeat bleeding until firm and air-free.

Step-by-Step: Rear Brake Circuit (Foot Pedal Master)

  1. Open the rear master reservoir (clean first) and top with fresh DOT fluid.
  2. Locate the rear caliper bleeder nipple and attach clear tubing to a catch bottle.
  3. Follow the same pumping & bleed sequence as the front: loosen bleeder, pump the pedal or use a bleeder tool, open the nipple to release fluid while pedal is held, then close before releasing the pedal. Repeat until clear fluid flows and no air bubbles are present.
  4. Tighten bleeder, top reservoir, replace cap, and confirm pedal firmness.

Full-Flush Method (Recommended for Complete Fluid Replacement)

  • Use a pressure bleeder or vacuum bleeder to push fresh fluid from the reservoir through all calipers until the expelled fluid is clear. This is faster and reduces the risk of introducing air.
  • If using manual bleeding, cycle until reservoir content is completely fresh, topping frequently to prevent drawing air into the master cylinder.

Final Checks

  • Inspect all bleeder screws and fittings for leaks and tighten to manufacturer recommendations. If you do not have torque specs, tighten snugly — avoid over-torquing which can strip threads.
  • Confirm lever and pedal firmness at rest and during a slow functional test in a safe area before riding at speed.
  • Wipe any spilled fluid off painted surfaces and treat affected areas with water to neutralize.
  • Dispose of old brake fluid responsibly.

Troubleshooting

  • Persistent spongy lever/pedal after thorough bleeding indicates either trapped air in a line/caliper, a leaking hose or fitting, or a failing master cylinder. Inspect components and replace if necessary.
  • If bubbles keep appearing immediately after closing the bleeder, check for a loose hose, damaged bleeder screw, or a cracked caliper port.

Model-Specific Maintenance Notes

  • Inspect brake lines for wear and chafing at the steering head and suspension pivot points unique to 4X4 operation.
  • Check caliper mounting bolts and pad wear when the wheels are removed; replace pads if below factory minimum thickness.
  • Because the Rancher is often used in muddy & wet conditions, inspect and clean calipers and bleeder screws regularly to prevent corrosion and seizing.
  • Keep a fresh spare bottle of the correct DOT fluid on hand — the 420’s compact reservoirs are easy to run low during bleeding.

Perform brake fluid replacement every two years or sooner when the fluid is dark or contaminated. Proper, periodic flushing preserves braking performance and component life on your 2016 Rancher 420.

Related Shopping Categories

Shop Brake Fluid for a 2016 Honda Rancher 420 4X4 POWER STEERING (FM2) ATV.

Shop Brake Bleeders for a 2016 Honda Rancher 420 4X4 POWER STEERING (FM2) ATV.

Shop Brake Pads for a 2016 Honda Rancher 420 4X4 POWER STEERING (FM2) ATV.

Shop Brake Lines for a 2016 Honda Rancher 420 4X4 POWER STEERING (FM2) ATV.

Shop Brake Tools for a 2016 Honda Rancher 420 4X4 POWER STEERING (FM2) 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.