How to Bleed & Replace Brake Fluid on a 2011 Yamaha Grizzly 350 4X4 IRS

Shop parts for a 2011 YAMAHA GRIZZLY3I4 ATV.

This MotoSport-exclusive service guide walks you step-by-step through draining, flushing, and bleeding the hydraulic brake system on the 2011 Yamaha Grizzly 350 4X4 IRS. Follow these instructions carefully to restore brake performance and avoid introducing air into the system. Read all steps before starting and work in a well-ventilated, clean area.

What you need

  • Yamaha-approved DOT 4 brake fluid (use only the spec indicated in your owner’s manual; DOT 4 is commonly used)
  • Clear plastic tubing that fits snugly over the bleeder nipples
  • Catch bottle for old fluid
  • Syringe or turkey baster (for removing fluid from the reservoir)
  • Brake bleeder wrench or appropriate open-end wrench (8 or 10 mm depending on bleeder)
  • Assistant (recommended) or a one-person vacuum or pressure bleeder
  • Clean rags, nitrile gloves, safety glasses
  • Jack and stands or ramps to safely lift and secure the ATV
  • Service manual or torque specs (recommended)

Model-specific notes for the 2011 Yamaha Grizzly 350 4X4 IRS

  • The Grizzly 350 4X4 IRS uses hydraulic disc brakes front and rear. There is no factory ABS system to complicate bleeding.
  • Reservoir location: master cylinder reservoir is on the handlebar (front) and a rear reservoir may be combined via a remote reservoir line depending on configuration; confirm your machine’s layout before starting.
  • Use only recommended brake fluid. DOT 4 is typical for this model year; DO NOT mix DOT 3, DOT 4, or DOT 5.1 unless specified — mixing can reduce performance and damage seals.
  • Bleeder nipple sizes and torque values can vary; use the Yamaha service manual for exact torque but snug bleeder screws by hand then tighten to low torque to avoid rounding or breaking (typical bleeder torque is small — about 8–10 Nm for many ATV calipers).
  • Brake hose routing on IRS suspension moves with the wheel; check hoses for cracks, chafing, and fittings for leaks while you have the system open.

Preparation

  • Park on level ground and secure the ignition off and key removed. Work with the engine cold to avoid hot components.
  • Raise and support the wheels you will work on so the rotors can spin if needed. Use jack stands or ramps rated for your ATV.
  • Clean the area around the master cylinder reservoir cap to avoid contamination. Remove cap and diaphragm; cover reservoir with a clean rag to limit dust entry.
  • Wear eye protection and gloves. Brake fluid is corrosive to paint & plastic — clean spills immediately with water.

Drain & Replace fluid (basic flush)

  1. Using a syringe or turkey baster, remove as much old fluid from the master reservoir as possible. Do not remove the reservoir from the bike unless you know how to reattach lines without introducing air.
  2. Refill reservoir with fresh DOT 4 fluid to the “MAX” line. Keep the cap off but the reservoir covered with a clean rag.
  3. Start at the wheel farthest from the master cylinder, typically the rear caliper on many ATVs; for Grizzly 350 confirm front/rear distances. A good sequence is rear, right front, left front, finishing at the master cylinder feed line if present.
  4. Fit clear tubing over a bleeder nipple and submerge the other end in a catch bottle partially filled with clean fluid to prevent air from being drawn back in.
  5. Have an assistant slowly apply the brake lever or pedal several times and then hold it down. With the lever held down, open the bleeder nipple slightly to allow fluid and air to escape until flow slows, then close the nipple before the assistant releases the lever. Repeat until the fluid runs clear and bubble-free.
  6. Keep reservoir fluid level above the “MIN” mark at all times. Top up with fresh fluid between calipers to prevent drawing air into the system.
  7. Repeat steps for each caliper in your chosen sequence until all lines are clear.

Alternative methods

  • Vacuum bleeder: Attach vacuum bleeder to bleeder nipple, open nipple, then pump fluid from the reservoir. Monitor reservoir level and close nipple before removing vacuum.
  • Pressure bleeder: Attach to reservoir and pressurize per tool instructions, then open bleeders one by one from farthest to nearest. This is effective for solo technicians but use a regulator and monitor pressure (never exceed safe pressures).

Finishing steps & checks

  • When bleeding is complete, leave each bleeder nipple tightened to spec. Wipe away any spilled fluid and reinstall the reservoir diaphragm & cap securely.
  • Pump the brake lever/pedal several times to confirm a firm feel. A spongy lever indicates remaining air; repeat bleeding as needed.
  • Inspect brake hoses, calipers, and reservoir for leaks. Check pad thickness and rotor condition while wheels are still elevated.
  • Lower the ATV and perform a slow, cautious test ride in a safe area to verify braking performance before returning to normal use.
  • Dispose of old brake fluid properly at a hazardous waste facility.

Troubleshooting

  • Persistent soft lever: likely still air in system — repeat bleeding sequence and ensure reservoir never runs low during the process.
  • Brake dragging after bleeding: caliper pistons may be seized or pads too tight; check caliper guide pins and piston movement, clean and lubricate per service manual.
  • Contaminated fluid with moisture: replace all fluid and flush lines; water reduces boiling point and can cause fade under heavy use.

Maintenance tips

  • Bleed and replace brake fluid every 1–2 years or sooner if fluid becomes dark or if you notice reduced braking performance.
  • Keep a small spare bottle of correct-spec brake fluid in your garage; store sealed and upright to avoid moisture absorption.
  • During trail use, inspect hoses near IRS linkages frequently for chafing where suspension moves.

Follow this MotoSport procedure to keep your 2011 Yamaha Grizzly 350 4X4 IRS braking system reliable and safe. If you encounter seized bleeders, damaged hoses, or major caliper issues, consult a professional technician or authorized Yamaha service center.

Related Shopping Categories

Shop Brake Fluid for a 2011 YAMAHA GRIZZLY3I4 ATV.

Shop Brake Bleeders for a 2011 YAMAHA GRIZZLY3I4 ATV.

Shop Brake Pads for a 2011 YAMAHA GRIZZLY3I4 ATV.

Shop Brake Lines for a 2011 YAMAHA GRIZZLY3I4 ATV.

Shop Brake Tools for a 2011 YAMAHA GRIZZLY3I4 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.