How to Bleed and Replace Brake Fluid on a 1999 Kawasaki Bayou 220 2X4
Shop parts for a 1999 Kawasaki Bayou 220 2X4 ATV.
This MotoSport exclusive guide walks you through a complete, durable brake-fluid change and bleed for the 1999 Kawasaki Bayou 220 2X4. Procedures below assume basic mechanical skill, a clean workspace, and standard hand tools.
What you’ll need
- DOT 3 brake fluid (Kawasaki recommends DOT 3 compatibility; DOT 4 is acceptable if specified on replacement parts)
- Clear plastic 1/8" or 3/16" hose to fit bleed nipples
- Catch bottle for old fluid
- Turkey baster or fluid siphon
- Brake cleaner, rags, safety glasses, nitrile gloves
- Wrenches to fit bleed nipples (usually 8 mm or 10 mm)
- Floor jack or ramps and axle stands to raise the ATV securely
- Small screwdriver or pick to lift rubber dust caps
Safety & prep
- Work on a level surface with the ignition OFF and the key removed.
- Wear eye protection and gloves. Brake fluid damages paint & plastics – protect painted surfaces and wipe spills immediately.
- Keep fire sources away from brake fluid.
Notes specific to the 1999 Bayou 220 2X4
- The Bayou 220 uses a simple hydraulic braking system without ABS — components are serviceable and common for home maintenance.
- Older bikes of this vintage often have brittle rubber hoses and corroded wheel-cylinder threads — inspect hoses, banjo bolts, master cylinder boot, and wheel cylinders for cracking or leakage and replace if suspect.
- Some Bayou 220 models use a handlebar master-cylinder for the front and a pedal-actuated master for rear braking; check both reservoirs and be prepared to bleed both systems if separate.
- Bleed nipples on drum wheel cylinders may be recessed or have dust caps; clean around nipples to avoid contamination before opening.
- Replace the master-cylinder reservoir cap O-ring if the cap shows age — a poor seal lets moisture in, reducing fluid life.
Step-by-step: drain, replace fluid, and bleed
- Raise and secure the ATV so wheels can rotate freely. Remove wheels if needed to access bleed nipples.
- Clean the area around each master-reservoir cap and each bleed nipple with brake cleaner. Remove dust caps.
- Inspect lines, fittings, and wheel cylinders for leaks or corrosion. If any hose, clamp, or wheel cylinder appears compromised, replace before bleeding.
- Open the reservoir cap(s) and remove the diaphragm. Use a turkey baster or siphon to remove as much old fluid as possible from the reservoir(s).
- Refill reservoir with fresh DOT 3 brake fluid to the full mark. Keep the cap loosely seated to avoid contamination while you work.
- Determine bleed order: start with the wheel farthest from the master cylinder and work toward the closest. If the system has two separate master cylinders, treat each system independently starting from the farthest wheel served by that master.
- Attach the clear hose to the bleed nipple of the chosen wheel and route the other end into a catch bottle partially filled with fresh fluid to prevent air re-entry.
- Have an assistant slowly pump the brake lever or pedal several times and hold it in the applied position. While held, open the bleed nipple about a quarter turn to allow fluid and air to flow out into the hose. Close the nipple before the assistant releases the lever/pedal. Repeat this pump-hold-open-close sequence until you see clear, bubble-free fluid exiting.
- Keep the reservoir topped off during the entire process – never let it run dry. If the reservoir empties, you will introduce air and need to restart the bleed sequence.
- Repeat for each wheel in the correct order until all lines deliver clear fluid with no air bubbles.
- Once bleeding is complete, torque bleed nipples to factory or snug specifications, install dust caps, refill reservoir to the proper level, reinstall diaphragm & cap, and wipe any spilled fluid. Refit wheels and torque wheel nuts to spec.
- Test brake lever/pedal feel with the ATV on stands first, then perform a low-speed road test in a safe area to confirm firm braking before normal use.
Common problems & troubleshooting
- Spongy lever after bleeding: usually air remains in the system — repeat bleeding starting with the farthest wheel and ensure the reservoir never runs dry.
- Brake fluid level keeps dropping: inspect for leaks at hose fittings, wheel cylinders, banjo bolts, and master-cylinder seals.
- Poor brake performance after fluid change: contaminated fluid or worn internal components. If bleeding doesn’t restore performance, consider replacing master cylinder seals, hoses, or wheel cylinders.
Maintenance tips
- Change brake fluid every 2 years or sooner if exposed to moisture or heavy use.
- Inspect rubber hoses and wheel-cylinder boots annually for cracking; replace at first sign of deterioration.
- Keep a small spare master-cylinder cap O-ring and a set of replacement bleed-nipple washers in your toolkit for field repairs.
Following this MotoSport procedure will restore clean fluid and a firm, reliable brake feel on your 1999 Kawasaki Bayou 220 2X4. If you discover major leaks, seized wheel cylinders, or a failing master cylinder, replace the faulty component before riding.
Related Shopping Categories
Shop Brake Fluid for a 1999 Kawasaki Bayou 220 2X4 ATV.
Shop Brake Bleeders for a 1999 Kawasaki Bayou 220 2X4 ATV.
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Shop Brake Lines for a 1999 Kawasaki Bayou 220 2X4 ATV.
Shop Brake Tools for a 1999 Kawasaki Bayou 220 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.
