How to Bleed & Replace Brake Fluid on a 2019 Textron Alterra 150
Shop parts for a 2019 Textron Alterra 150 ATV.
This MotoSport-exclusive guide walks you through safely flushing and replacing the brake fluid on a 2019 Textron Alterra 150. It covers tools, supplies, step-by-step procedures for a complete bleed, model-specific tips, and safety precautions. Follow each step carefully & work methodically to preserve braking performance and system longevity.
What you need
- Brake fluid: use the manufacturer-specified DOT rating listed on the master cylinder cap or owner's manual (if unsure, check the cap first). Only use fresh, sealed fluid from an unopened container.
- Clear plastic tubing that fits snugly over the bleed nipples
- Catch bottle or reservoir to collect old fluid
- Box-end wrench set for bleed nipples (size varies by nipple; have multiple sizes available)
- Turkey baster or fluid syringe for removing old fluid from the master reservoir
- Clean rags, brake cleaner, disposable gloves, eye protection
- Assistant to operate the brake lever/pedal (recommended) or a pressure/vacuum bleeder
- Jack or stands to safely raise the ATV if wheel access is required
Pre-bleed prep
- Park the ATV on level ground, set the parking brake if applicable, remove the key, and disconnect the battery negative lead if you will be working near electrical components.
- Clean around the master cylinder cap and each bleed nipple to prevent contamination of the system.
- Inspect hoses, lines, calipers, and wheel cylinders for leaks or damage — replace any suspect components before bleeding fluid.
- Open a fresh container of the correct DOT fluid and keep the cap closed when not pouring to avoid moisture absorption.
Master cylinder servicing
- Remove the master cylinder reservoir cap and diaphragm. Use a turkey baster to remove most of the old fluid from the reservoir so fresh fluid won’t be contaminated immediately.
- Bench-bleed the master cylinder if it has been removed. If not removing it, at minimum fill the reservoir with fresh fluid and keep the cap off during initial bleeding so trapped air can escape.
- Keep the reservoir topped with fresh fluid during the entire procedure to avoid drawing air back into the system.
Bleeding order & strategy
- Always bleed starting with the wheel farthest from the master cylinder and work toward the closest. On many small ATVs that means front right > front left > rear (confirm physical layout before starting).
- Use a helper to pump the brake lever/pedal slowly then hold pressure while you open the bleed nipple. If using a vacuum or pressure bleeder, follow the tool manufacturer’s instructions.
Step-by-step bleed procedure
- Attach clear tubing to the bleed nipple and place the other end in a catch bottle partially filled with clean brake fluid to prevent air re-entry.
- Have your helper pump the brake lever/pedal several times and hold firm. Loosen the bleed nipple one quarter to half turn to let fluid and air escape into the tubing. Tighten the nipple before your helper releases pressure. Repeat until no air bubbles appear and fluid runs clear.
- Keep the master reservoir topped as you work to prevent suction of air into the system.
- Work through each brake point in the correct order, repeating the pumping/opening cycle until each point produces clear, bubble-free fluid.
- After finishing the last wheel, go back and re-check the farthest wheel to confirm no air migrated back into the lines.
- Once satisfied, tighten all bleed nipples to proper snugness, wipe clean, and reinstall the master cylinder cap and diaphragm, making sure the cap seals correctly.
Final checks
- With the ATV still off the ground, apply the brake and verify firm feel — minimal travel and no sponginess. If soft, repeat bleeding steps.
- Lower the ATV, do a low-speed test ride in a safe area to confirm normal brake response and no leaks.
- Properly dispose of used brake fluid according to local regulations — do not pour down drains or on soil.
Model-specific notes for the 2019 Textron Alterra 150
- Reservoir capacity is small — the Alterra 150 uses a compact master cylinder reservoir. Maintain a high fluid level during bleeding to avoid drawing air into the system.
- Plastic components nearby can be damaged by spilled fluid. Protect painted or plastic surfaces and immediately wipe any spills with brake cleaner and a clean rag.
- Fastener sizes on bleed nipples are compact; use the correct wrench size to avoid rounding the nut. Keep replacement bleed screws on hand if nipples are corroded or rounded.
- Because this is a youth/small-displacement ATV, braking components are smaller and contain less fluid — even small amounts of trapped air will noticeably affect brake feel. Be thorough until the lever/pedal is firm.
- Inspect cable routing and brake lever pivot for wear while you work; minor adjustments and lubrication of pivot points improve long-term performance.
Troubleshooting
- Persistent soft lever after multiple bleeds usually indicates a leak, a failed master cylinder seal, or trapped air in a hard-to-reach spot. Inspect for leaks and consider master cylinder replacement if serviceable seals fail.
- If contamination (dark, cloudy fluid or particles) is present, perform a full system flush until the expelled fluid is clear and new fluid flows from each bleed point.
Safety reminders
- Brake fluid is hygroscopic — always store sealed and use fresh fluid when performing maintenance.
- Wear gloves and eye protection. Keep fluid off painted surfaces and plastics; it may damage finishes.
- If you are not confident performing the bleed correctly, have a professional technician complete the job to ensure safe braking.
Follow this MotoSport-specific procedure to restore firm braking on your 2019 Textron Alterra 150. If you need replacement parts or consumables while servicing your brakes, use the parts link above to get the right components for your ride.
Related Shopping Categories
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Shop Brake Tools for a 2019 Textron Alterra 150 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.