How to Bleed and Replace Brake Fluid on a 2013 Yamaha Grizzly 300 2X4
Shop parts for a 2013 Yamaha Grizzly 300 2X4 ATV.
Follow this MotoSport-branded, step-by-step guide to safely replace and bleed the hydraulic brake fluid on a 2013 Yamaha Grizzly 300 2X4. This procedure covers the master cylinder reservoir, front calipers and rear brake circuit so you restore firm braking performance and protect seals and lines.
Tools & supplies
- DOT 3 brake fluid (Yamaha specifies DOT 3 for the Grizzly 300) unopened container
- Clear bleed tubing that fits bleeder nipples
- Plastic catch bottle with fresh fluid (label bottle "old fluid")
- Wrenches for bleeder nipples (open-end, appropriate metric size)
- Screwdriver or small pliers to open reservoir cap clips
- Shop rags, nitrile gloves, eye protection
- Floor jack or stands to lift wheels if required
- Assistant to pump the brake lever/pedal (recommended)
- Brake parts cleaner and wire brush for fitting cleanup
Safety first
- Work on a level surface with the engine off and key removed.
- Brake fluid damages paint and plastics — wipe spills immediately and protect bodywork with rags or tape.
- Never reuse opened fluid already contaminated. Close new fluid tightly after use.
- Dispose of old fluid at a proper recycling facility.
Notes specific to the 2013 Yamaha Grizzly 300 2X4
- The Grizzly 300 2X4 uses a compact single front master cylinder feeding the front calipers and a rear master cylinder for the rear brake circuit; both systems are hydraulic and require fresh fluid to maintain pedal/lever feel.
- Stock routing and reservoir locations are accessible without major disassembly on the 2X4 model, but check for exposed brake hoses and aged clamps before starting — the 2013 model can show surface corrosion on bleeder nipples if not maintained.
- If the unit has aftermarket racks or guards, remove or reposition them to access bleed nipples and reservoirs cleanly.
Preparation
- Park ATV upright, secure it so it cannot roll. Lift front or rear wheels if desired for easier access to calipers.
- Clean the reservoir cap area thoroughly to keep contaminants out. Remove the cap and diaphragm carefully. Always keep reservoir covered when not actively adding fluid.
- Top the reservoir with fresh DOT 3 fluid to the full mark. Never reuse fluid drained from the system.
- Identify each bleeder nipple — front left, front right (if dual calipers) and rear. Check nipple threads and boots for corrosion and replace boots if brittle.
Bleeding order
Bleed the circuit farthest from the master cylinder first, then proceed to the next-farthest. Typical order for Grizzly 300 2X4:
- Front wheel farthest from master cylinder (usually right)
- Front wheel nearest master cylinder (usually left)
- Rear brake circuit
Bleeding step-by-step
- Attach clear tubing to the bleeder nipple and place the other end into the catch bottle partially filled with clean brake fluid (this prevents air re-entry).
- Have your assistant slowly pump the brake lever/pedal several times and hold pressure on the lever/pedal while you open the bleeder nipple about a 1/4 turn. Fluid and air bubbles will flow into the tube. Close the nipple before the assistant releases pressure. Repeat until no air bubbles appear and fluid runs clear.
- Keep the master cylinder reservoir topped between cycles to avoid introducing air into the system.
- Repeat the process for each bleeder nipple in the order listed above. For each nipple: pump — hold — open — close — release — top reservoir, until clear.
- For stubborn air pockets, use short firm pumps rather than long slow pumps, or use a one-person vacuum or pressure bleeder following the tool manufacturer instructions. If using pressure tools, keep reservoir cap vented per tool instructions.
- After bleeding all points, ensure nipples are snug (do not overtighten), wipe fittings clean, replace dust boots, and top the reservoir to the full mark. Reinstall cap and diaphragm securely.
System check
- Operate the brake lever/pedal multiple times to confirm firm, consistent feel. If you still have a spongy lever, repeat bleeding until firm.
- Inspect for leaks around calipers, lines and nipples while applying steady pressure.
- Test ride slowly in a controlled area to confirm braking performance before normal use.
Maintenance tips & troubleshooting
- Replace brake fluid every two years or sooner if contaminated. Fresh fluid protects the internal seals and maintains boiling point.
- If you find persistent air that won't purge, remove the caliper and bench-bleed it or check for collapsed hoses, a leaking master cylinder, or internal caliper seal failure.
- Corroded bleeder nipples can round off — clean threads with a wire brush and protect with light grease on assembly. Replace badly corroded nipples to avoid rounding or leaks.
- Keep an inline catch and avoid reusing expelled fluid; old fluid absorbs moisture and lowers boiling point.
Final notes
Routine fluid replacement and careful bleeding restore braking confidence on the 2013 Yamaha Grizzly 300 2X4. Inspect hoses, fittings and boots while you work — replacing aged components prevents repeated bleeding and keeps the system reliable.
Related Shopping Categories
Shop Brake Fluid for a 2013 Yamaha Grizzly 300 2X4 ATV.
Shop Brake Bleeders for a 2013 Yamaha Grizzly 300 2X4 ATV.
Shop Brake Pads for a 2013 Yamaha Grizzly 300 2X4 ATV.
Shop Brake Lines for a 2013 Yamaha Grizzly 300 2X4 ATV.
Shop Brake Tools for a 2013 Yamaha Grizzly 300 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.
