How to Bleed & Replace Brake Fluid on a 2012 Yamaha Grizzly 450 4X4 POWER STEERING
Shop parts for a 2012 Yamaha Grizzly 450 4X4 POWER STEERING ATV.
This MotoSport-exclusive, step-by-step guide covers flushing the brake system and replacing brake fluid on the 2012 Yamaha Grizzly 450 4X4 Power Steering (MMY code GRIZZLY45E). It includes model-specific notes and safety reminders so you can do the job reliably at home.
What you need
- DOT 4 brake fluid (do not use DOT 5 silicone)
- Clear plastic tubing that fits bleed nipples
- Catch bottle for old fluid
- Brake-bleeder wrench or appropriate open-end wrench
- Hand vacuum bleeder or pressure bleeder (recommended) or helper for pedal/lever method
- Clean rags and safety gloves
- Torque wrench (for caliper pins/bolts if removed)
- Jack and stands or ramps to lift wheels slightly (if needed)
Model-specific notes for the 2012 Grizzly 450 4X4 Power Steering
- MMY: YAMAHA;GRIZZLY45E;2012
- Brake reservoir is mounted on the handlebar assembly – keep it upright and capped to avoid contamination.
- The Grizzly uses hydraulic calipers front & rear with conventional bleed nipples; there's no ABS system on this model year.
- Power steering components sit in front of the frame; take care not to let brake fluid contact painted surfaces or the power steering pump/seals.
- If the bike has been ridden hard or regularly in deep water, inspect caliper seals, hoses & master cylinder for moisture damage before bleeding.
Preparation
- Park on level ground, engine off, key out, parking brake applied (if equipped). Block wheels for safety.
- Clean around the reservoir cap to prevent dirt entering the system.
- Remove the reservoir cap and diaphragm; keep a clean rag over the opening to reduce exposure to air.
- Inspect brake lines, hoses and caliper bleeder valves for corrosion or damage — replace any suspect components before bleeding.
- Wear nitrile gloves and eye protection. Brake fluid is corrosive to paint & plastics.
Bleed sequence
For the most effective purge of old fluid and air use this sequence: start with the caliper farthest from the master cylinder and work to the closest. On the Grizzly that typically is:
- Rear right (farthest)
- Rear left
- Front right
- Front left (closest)
If you're unsure which is farthest, pick the caliper diagonally opposite the master cylinder as the first one.
Bleeding procedure – pressure or vacuum bleeder (recommended)
- Fill the master cylinder reservoir with fresh DOT 4 brake fluid, leaving the cap off but covered.
- Attach clear tubing to the bleeder nipple and submerge the other end in a catch bottle partially filled with clean brake fluid to prevent air re-entry.
- Attach your pressure or vacuum bleeder per its instructions to the reservoir or bleed nipple. Maintain fluid level in the reservoir throughout the process.
- Open the bleed valve about a 1/4 to 1/2 turn. Allow fluid and air to flow until clear, bubble-free fluid appears. Close the valve before moving to the next caliper.
- Repeat for each caliper in the sequence above. Top up the reservoir frequently so it never runs dry.
- When all calipers are clear, tighten bleeder valves to spec snugness, wipe clean, and reinstall reservoir diaphragm & cap.
- Operate the brake lever/pedal to confirm a firm feel. If spongy, repeat bleeding until firm.
Bleeding procedure – two-person manual method
- One person holds the brake lever/pedal; the other opens/closes bleed valves.
- With the reservoir full, attach tubing to the first bleeder and submerge end in catch bottle with fluid.
- Helper slowly applies steady pressure to the lever/pedal, then holds it. Open the bleeder; fluid & air will escape. Close the bleeder before the helper releases pressure.
- Repeat until clear fluid with no bubbles is seen. Top the reservoir after each cycle.
- Move through calipers in the sequence above and repeat for each one.
Finishing steps
- Ensure all bleeder screws are tightened and torque/caliper bolt checks are performed if any hardware was moved.
- Wipe any spilled fluid from paint, plastic & power steering components immediately and rinse with water if contact occurred.
- Properly dispose of old brake fluid at a hazardous-waste facility or follow local regulations.
- Test ride slowly in a safe area to confirm brake performance; avoid hard use until brakes are confirmed solid and leak-free.
Troubleshooting
- Persistent spongy lever/pedal after multiple bleeds: inspect master cylinder, caliper pistons & hoses for internal leaks or collapse. Replace as needed.
- Air keeps returning: check for loose fittings, cracked hoses, or a leaking master cylinder seal allowing air in when pressure is released.
- Brake fluid contamination by water or oil: flush completely and replace all hoses if contamination is severe.
Maintenance tips specific to the Grizzly 450
- Replace brake fluid every 1-2 years or sooner if the machine is used in wet/muddy conditions.
- Inspect the power steering area for fluid weeps after bleeding — accidental spills can be mistaken for power-steering leaks.
- Keep an eye on front differential/steering-sprocket area for dirt ingress during service; clean before reassembly to avoid pushing grime into moving parts.
- Record the service date and fluid type in your maintenance log for future reference.
Following this MotoSport-specific guide will help ensure safe, reliable brake performance on your 2012 Yamaha Grizzly 450 4X4 Power Steering. If you encounter uncertain or repeated failures, have a certified technician inspect the system.
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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.