How to Bleed & Replace Brake Fluid on a 2011 Yamaha Grizzly 350 2X4

Shop parts for a 2011 Yamaha Grizzly 350 2X4 ATV.

This MotoSport proprietary guide walks you step-by-step through safely replacing and bleeding the brake fluid on a 2011 Yamaha Grizzly 350 2X4. Follow these steps carefully, use the correct tools and fluid, and perform final checks before riding.

What you’ll need

  • Manufacturer-specified brake fluid (use the fluid called out in your owner’s manual; many Yamaha models accept DOT 4 – confirm before starting)
  • Clear plastic tubing that fits snugly over the bleeder nipple
  • Small catch bottle or jar for old fluid
  • Gravity-bleeder or vacuum pump (recommended) or a helper for manual pumping
  • Wrench for bleeder nuts (usually 8mm or 10mm; have both on hand)
  • Clean rags, brake cleaner, nitrile gloves, eye protection
  • Torque wrench for any reassembly where specified

Important model-specific notes for the 2011 Yamaha Grizzly 350 2X4

  • The Grizzly 350 2X4 typically has a simple hydraulic system without ABS; bleeding follows conventional caliper-master cylinder sequence.
  • Master cylinder reservoir cap may have a diaphragm and internal filter – keep contaminants out and inspect the diaphragm for deterioration when you open it.
  • Brake components on this model are exposed to mud and water; inspect hoses, fittings, and calipers for cracks, corrosion or leaks while you work.
  • If the machine has aftermarket guards or skid plates, remove or access them to reach calipers and bleeders easily.
  • Avoid getting brake fluid on painted plastics or finish — it damages surfaces. Rinse immediately with water if contact occurs.

Safety precautions

  • Work on a flat, stable surface with the engine off and key removed.
  • Wear eye protection and gloves. Brake fluid is corrosive to skin and paint.
  • Keep the reservoir capped when not actively topping to minimize air ingress and contamination.
  • Dispose of old fluid per local regulations.

Step-by-step procedure

1. Prepare the ATV

  • Park the Grizzly on level ground and secure it on a stand so wheels can rotate freely if needed. Chock the wheels.
  • Clean around the master cylinder reservoir cap and the calipers to keep dirt out when opened.

2. Inspect components

  • Check pads, rotors, hoses and bleeder screws for leaks, damage or excessive wear. Replace damaged parts before bleeding.

3. Open the reservoir

  • Remove the reservoir cap and diaphragm carefully. Note fluid color: dark fluid indicates replacement is needed.
  • Top up reservoir with fresh brake fluid so level is above the minimum mark. Do not let the reservoir run dry during bleeding.

4. Choose a bleed method

  • Recommended: use a vacuum pump or a pressure bleeder for a one-person, clean job. Alternative: two-person manual pumping.

5. Bleeding order

Bleed starting with the caliper farthest from the master cylinder, then work to the closest. On the Grizzly 350 2X4 a common sequence is:

  • Rear caliper (if rear is farthest)
  • Then right/front caliper
  • Then left/front caliper

If unsure which is farthest, visually trace the brake lines from the master cylinder and pick the longest-run caliper first. The goal is to move air toward the master cylinder.

6. Bleeding procedure (vacuum or pressure method)

  • Attach clear tubing to the bleeder nipple and route into a catch container partially filled with old fluid to prevent air re-entry.
  • If using a vacuum pump: apply uum, then open the bleeder nipple about a quarter turn. Pull fluid until clear, bubble-free fluid exits. Close nipple before releasing vacuum. Top up reservoir as needed.
  • If using a pressure bleeder: pressurize per tool instructions, open bleeder nipple and allow fluid to flow until clear. Close nipple tightly when finished with that caliper.
  • Repeat the process at each caliper in the specified order until all fluid runs clear and free of bubbles and the brake lever/pedal feels firm.

7. Bleeding procedure (manual two-person method)

  • Person A sits at controls and pumps the brake lever/pedal several times then holds pressure.
  • Person B cracks the bleeder nipple to allow fluid/air out into tubing, then tightens nipple before Person A releases the lever/pedal. Repeat until clear fluid and no air bubbles appear.
  • Always keep reservoir topped between cycles so it does not run dry.

8. Final checks

  • Ensure all bleeder nipples are tightened to the correct snugness. Do not over-torque; consult service manual for exact specs if available.
  • Top reservoir to the proper level and reinstall diaphragm and cap.
  • Clean any spilled fluid from components and touch up or rinse painted surfaces if contact occurred.
  • Test lever/pedal for firm operation with wheels off the ground. Reinstall wheels or remove stands and perform a low-speed brake test in a safe area to confirm stopping power.

Troubleshooting

  • Spongy lever after bleeding: likely still air in the system — repeat bleeding sequence, paying special attention to keeping reservoir full.
  • Brake lever goes to the handlebar or pedal bottoms out: check for internal master cylinder leaks or collapsed hoses; inspect and replace components as needed.
  • Persistent contamination or dark fluid after multiple bleeds: consider a full system flush and inspect for internal corrosion or a contaminated reservoir cap.

Maintenance tips

  • Replace brake fluid every 1-2 years or sooner if contaminated; moisture absorption reduces boiling point and braking performance.
  • Inspect hoses and fittings annually; replace soft or cracked hoses. OEM replacement parts tailored to the 2011 Grizzly 350 2X4 ensure proper fit and performance.
  • Keep a service record of fluid changes and any component replacements.

Following this MotoSport guide will keep your Grizzly 350 2X4 braking system performing safely and reliably. If you encounter internal master cylinder or caliper failures, consult a qualified technician or MotoSport parts specialists for replacement components tailored to your model.

Related Shopping Categories

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Shop Brake Lines for a 2011 Yamaha Grizzly 350 2X4 ATV.

Shop Brake Tools for a 2011 Yamaha Grizzly 350 2X4 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.