How to Bleed & Replace Brake Fluid on a 2000 Yamaha Blaster

Shop parts for a 2000 Yamaha Blaster ATV.

This MotoSport-exclusive guide walks you through a thorough, model-specific brake fluid replacement and bleed for the 2000 Yamaha Blaster (YFS200). Follow these steps carefully to restore firm braking and maintain safe stopping performance.

What you'll need

  • DOT 3 or DOT 4 brake fluid (do not use DOT 5 silicone)
  • Clear plastic tubing that fits snugly over bleed nipples
  • Catch bottle or jar
  • Wrenches for bleed nipples (usually 8mm or 10mm)
  • Ratchet and sockets for caliper removal if needed
  • Clean rags, gloves, safety glasses
  • Brake parts cleaner or isopropyl alcohol
  • Torque wrench (recommended for reassembly)

Safety & model notes for the 2000 Yamaha Blaster

  • The Blaster is a simple, non-ABS ATV with hydraulic front and rear disc brakes. Master cylinders: handlebar front master and foot-operated rear master. Reservoirs are small – keep them topped while bleeding to avoid air entry.
  • Yamaha recommends DOT 3 or DOT 4; DOT 4 has higher boiling point and is compatible with DOT 3 systems. Never mix with DOT 5 silicone fluid.
  • Brake fluid will damage paint and plastic & will degrade rubber components over time. Wipe spills immediately and avoid contact with painted plastic panels common on the Blaster.
  • Inspect hoses, banjo bolts, caliper seals, and mounting hardware for age-related wear. The Blaster is an older model — replacing brittle hoses or corroded banjo hardware is often necessary when doing a fluid change.
  • Recommended service interval for fluid replacement is every two years or sooner if fluid is dark or contaminated.

Preparation

  • Park on level ground, engine off, parking brake engaged. Secure ATV on a stand so wheels can rotate for inspection.
  • Clean around reservoirs, master cylinders, calipers, and bleed nipples to prevent contamination.
  • Remove reservoir caps & diaphragms carefully. Don't let dirt fall in. Use a small piece of clean plastic to cover each reservoir while working if needed.
  • Wear gloves & eye protection. Brake fluid is corrosive to paint and skin.

Brake fluid replacement & bleeding — single caliper at a time

Bleed the system one circuit at a time: front then rear (or vice versa). Keep the reservoir topped with fresh fluid throughout the procedure.

1. Set up

  • Attach clear tubing to the bleed nipple on the caliper. Place the other end in a catch bottle partially filled with old fluid to prevent air from being drawn back in.
  • Open the bleed nipple about a quarter turn. Don't remove it.

2. Classic two-person method

  • Person A slowly applies steady pressure to the brake lever or pedal and holds it.
  • Person B opens the bleed nipple briefly to allow fluid and air to escape, then closes the nipple while pressure is still applied. Repeat until clear fluid without bubbles runs through the tubing.
  • Top up the reservoir between cycles to keep air from entering the system.

3. One-person method using pump & hold (if no helper)

  • Pump the brake lever/pedal several times, then hold firm pressure.
  • Open the bleed nipple to let fluid escape, then close it before releasing the lever/pedal. Repeat until fluid runs clear with no air bubbles.

4. Reverse or pressure-bleed option

  • If available, a vacuum pump on the bleed nipple or a pressure bleeder on the reservoir can speed the job and reduce the chance of introducing air. Follow tool instructions and keep fluid topped up.

5. Final checks

  • After bleeding each circuit, tighten bleed nipple to proper snugness. Do not overtighten; use torque spec if available from Yamaha service manual.
  • Refill reservoir to MAX line, reinstall cap & diaphragm, wipe any spilled fluid, and clean components with brake cleaner or isopropyl alcohol.
  • Confirm lever and pedal feel: lever should be firm with no sponginess. If soft, repeat bleeding until firm.
  • Test ride slowly in a safe area to confirm braking performance before normal use.

Additional Blaster-specific tips

  • Caliper and piston condition: the Blaster has compact calipers that can seize if not serviced. If bleeding doesn't restore good feel, remove calipers, inspect pistons and seals, and rebuild or replace as needed.
  • Banjo bolt copper crush washers: replace crush washers whenever you remove banjo bolts. Reuse risks leaks on the older Blaster hardware.
  • Routing & clip condition: check brake hose routing near A-arms and swingarm for rubbing. Replace hoses showing cracks, swelling, or soft spots.
  • Master cylinder reservoirs are small — when flushing, change fluid more frequently and avoid letting reservoirs run very low to prevent air intake.

Disposal & maintenance schedule

  • Drain catch fluid into a sealed container and dispose of it according to local hazardous-waste rules. Do not pour brake fluid into drains.
  • Replace brake fluid every two years, more often if you ride in wet or harsh conditions.

Troubleshooting

  • Persistent spongy lever after proper bleeding: inspect caliper pistons, master cylinder seals, and hose condition. Replace worn seals or hoses.
  • Leaking around reservoir, banjo, or bleed nipple: replace damaged gaskets/crush washers and tighten to spec.
  • Brake drag after reassembly: ensure caliper slides are clean and pins move freely; check for over-tightened bolts or collapsed hoses.

Follow this MotoSport-exclusive procedure to successfully replace and bleed brake fluid on your 2000 Yamaha Blaster. Proper fluid maintenance and component inspection will keep your Blaster stopping safely and reliably.

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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.