How to Bleed and Replace Brake Fluid on a 2003 Yamaha Bear Tracker
Shop parts for a 2003 YAMAHA BEARTRACKE ATV.
This MotoSport guide walks you through bleeding and replacing the brake fluid on a 2003 Yamaha Bear Tracker (owner MMY: YAMAHA;BEARTRACKE;2003). Follow these steps carefully to restore firm brake feel and prevent corrosion or contamination. Read the safety notes, gather tools and parts, then proceed methodically. This guide is MotoSport proprietary and tailored for Bear Tracker owners.
Safety & notes specific to the 2003 Bear Tracker
- Brake system type: brake components on the 2003 Bear Tracker are conventional hydraulic units without ABSsimple piston calipers and a small reservoir. Refer to your owner’s manual for exact fluid type, but Yamaha commonly specifies DOT 4 for similar models; if in doubt use DOT 4 or confirm before starting.
- Use only fresh, sealed brake fluid. Do not reuse drained fluid. Brake fluid absorbs moisture quickly — keep containers sealed and work fast.
- The fluid reservoir on the Bear Tracker is small: check and top frequently during bleeding to avoid introducing air.
- Brake hoses on older ATVs can be brittle. Inspect hoses, banjo fittings, and boots for leaks or damage before reassembly.
- Dispose of old fluid properly. Brake fluid is hazardous waste.
Tools & supplies
- Fresh DOT 4 brake fluid (or DOT 3 if your manual specifies)
- Clear plastic tubing that fits tightly over the bleeder nipple
- Catch bottle for old fluid
- Wrench for bleeder nipple (typically 8 mm or 10 mm)
- Screwdriver or small pick (to remove rubber bleeder cap)
- Turkey baster or fluid syringe (to remove old fluid from reservoir)
- Rags, brake cleaner, gloves, eye protection
- Optional: vacuum bleeder or pressure bleeder for one-person operation
Preparation
- Park the ATV on level ground, engage gear or park brake, and block wheels. Work with the engine off and ignition key in OFF.
- Clean the master cylinder reservoir cap and surrounding area to prevent contamination when opened.
- Remove the reservoir cap and diaphragm. Use a turkey baster to remove as much old fluid as possible from the reservoir.
- Top up with fresh fluid to the lower mark. Do not overfill.
- Raise the wheel(s) if needed so you can access the caliper bleeder nipple and spin the rotor to expel trapped air easily. Secure the machine safely on stands.
Bleeding sequence
Standard practice: bleed the caliper farthest from the master cylinder first, then move to the next farthest. On the Bear Tracker this typically means rear caliper first, then front (confirm by visually tracing brake lines from the master cylinder).
Manual two-person bleed method
- Attach clear tubing to the bleeder nipple and place the other end in a catch bottle partially filled with fluid to prevent air from being drawn back in.
- Have your helper slowly squeeze the brake lever or pedal several times and hold it compressed.
- With lever held, open the bleeder nipple about a quarter to a half turn. Fluid and air will flow into the tubing. Tighten the nipple before the helper releases the lever.
- Repeat: pump to pressurize, hold, crack bleeder, tighten, then release. After each cycle, top up the master cylinder reservoir to prevent it from running dry.
- Continue until bubbles stop and only clear fluid without contamination appears at the tubing end.
- Torque the bleeder nipple snugly (do not over-torque), replace the rubber cap, and move to the next caliper.
One-person vacuum or pressure bleeder method
- Attach vacuum pump hose to bleeder nipple or attach pressure bleeder to the master cylinder per tool instructions.
- If using vacuum: open bleeder and run vacuum until clear fluid flows without bubbles.
- If using pressure bleeder: pressurize reservoir, then open each bleeder to let fluid flow until clear and bubble-free.
- Top off reservoir as needed and close bleeders when finished.
Finishing steps
- Top the master cylinder to the proper level, reinstall the diaphragm and cap, and secure it.
- Clean any spilled fluid from paint, plastic, and rubber with water and brake cleaner; brake fluid can damage finishes.
- Inspect all fittings and hoses for leaks while applying steady brake pressure; ensure firm pedal/lever feel.
- Lower the ATV, test brakes at low speed in a safe area to confirm proper operation before normal riding.
- Record the service date and fluid type in maintenance logs.
Common troubleshooting
- Persistent spongy lever/pedal after bleeding: recheck for air in the system, leaking seals, or a faulty master cylinder.
- Dark, contaminated fluid: if fluid is heavily discolored or contains debris, flush fully and inspect internal lines and caliper pistons for corrosion.
- Soft feel that returns after a short ride: likely moisture-contaminated fluid or boiling under heavy use — replace with fresh higher-spec DOT 4 if the manual allows.
Model-specific maintenance tips
- Inspect caliper pistons and dust boots on the 2003 Bear Tracker for age-related wear; replace boots if cracked to prevent contamination.
- Check banjo bolt crush washers whenever you open the line — replace them to avoid leaks.
- If the machine has sat for years, consider replacing flexible brake hoses as preventive maintenance; internal collapse can mimic air in the system.
Follow this MotoSport procedure for a clean, safe brake fluid change. If you encounter persistent issues or major leaks, stop and consult a qualified technician.
Related Shopping Categories
Shop Brake Fluid for a 2003 YAMAHA BEARTRACKE ATV.
Shop Brake Bleeders for a 2003 YAMAHA BEARTRACKE ATV.
Shop Brake Pads for a 2003 YAMAHA BEARTRACKE ATV.
Shop Brake Lines for a 2003 YAMAHA BEARTRACKE ATV.
Shop Brake Tools for a 2003 YAMAHA BEARTRACKE 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.