How to Bleed and Replace Brake Fluid on a 1995 Yamaha Wolverine 350
Shop parts for a 1995 YAMAHA WOLV350 ATV.
This MotoSport-exclusive step-by-step guide shows you how to properly replace and bleed the brake fluid on a 1995 Yamaha Wolverine 350 ATV. Follow these procedures carefully to restore firm brake feel, remove moisture and contamination from the system, and protect painted surfaces from fluid damage.
What you need
- Brake fluid: DOT 3 or DOT 4 rated fluid (use DOT type recommended by Yamaha manual; DOT 4 preferred for better boiling resistance)
- Clear plastic tubing to fit bleed nipple
- Small clear catch bottle with about 12 oz capacity
- Brake bleeder wrench or 8-10 mm wrench (size depends on bleed nipple)
- Turkey baster or syringe (to remove old fluid from reservoir)
- New reservoir cap gasket if cracked or swollen
- Rags and isopropyl alcohol for cleanup
- Latex or nitrile gloves and eye protection
- Jack or ramps and blocks to safely support the ATV if wheel removal necessary
Model notes for the 1995 Yamaha Wolverine 350
- The Wolverine 350 uses a simple hydraulic master cylinder with individual caliper bleed nipples. Front and rear systems are separate but share similar bleed points.
- The brake fluid reservoir is mounted near the handlebar master cylinder for the front and near the rear brake master cylinder for the rear, depending on your model configuration — both reservoirs are translucent plastic allowing fluid level inspection.
- Corrosion of bleed nipples is common on older machines. Apply penetrating oil before loosening and use the correct wrench to avoid rounding the nut.
- Brake fluid damages paint and plastic — wipe spills immediately with isopropyl alcohol and rags.
- Replace cracked or hardened hoses and the reservoir cap gasket; these fail commonly on 1990s ATVs and will compromise a bleed.
Preparation
- Work on a level surface, engine off and key removed.
- Remove any heavy gear from the ATV. Secure the machine with the parking brake off when bleeding rear system to allow pedal travel if needed.
- Clean the reservoir cap area before opening to prevent contamination.
- If wheel removal makes access easier, support the ATV safely on jack stands or ramps.
Step 1 – Remove old fluid from reservoir
- Open the reservoir cap and use a turkey baster or syringe to remove old fluid, leaving only a small amount to keep the master cylinder wet. Discard used fluid properly.
- Refill with fresh brake fluid to the full mark. Keep the cap loosely in place to minimize exposure to air while you work.
Step 2 – Single-person basic bleed (suitable if one helper not available)
- Attach clear tubing to the caliper bleed nipple. Put the other end into the catch bottle partly filled with fresh brake fluid (to prevent air being drawn back in).
- While seated or positioned to access the brake lever/pedal, slowly pump the lever/pedal several times then hold it depressed.
- Open the bleed nipple about 1/4 turn until fluid and bubbles flow into the tube. Close the nipple before releasing the lever/pedal. Repeat until no air bubbles appear and fluid runs clear.
- Top off the reservoir frequently to prevent drawing air into the master cylinder.
- Tighten the bleed nipple to the specified snugness once bleeding is complete for that caliper.
Step 3 – Two-person bench-style bleed (preferred)
- Person A gently pumps the brake lever/pedal and holds it depressed.
- Person B opens the bleed nipple to let fluid escape into the tubing and closes it before Person A releases the lever/pedal. Repeat until clear fluid with no bubbles appears.
- Top off the reservoir regularly and work front and rear systems independently.
Step 4 – Flush entire system
- After initial bleeding, perform multiple reservoir refills and full-cycle bleeds until the fluid leaving the bleed nipple matches new fluid color and shows no bubbles.
- Work from the caliper furthest from the master cylinder to the nearest if multiple calipers are present — this ensures trapped air is pushed toward the master cylinder and out.
Step 5 – Final checks and cleanup
- Top the reservoir to the correct level, install a clean cap and new gasket if needed.
- Torque bleed nipples to spec or snug tightly; check both front and rear for leaks.
- Pump the brake lever/pedal to confirm firm, consistent feel before riding. If the lever/pedal feels mushy, repeat bleeding.
- Wipe any spilled fluid from painted surfaces with isopropyl alcohol immediately.
- Dispose of old fluid at a proper hazardous-waste facility.
Troubleshooting
- Persistent soft lever/pedal: check for a leak, collapsed hose, or faulty master cylinder caliper seals; repeat bleed after repairs.
- Difficult to get air out: consider bench-bleeding the master cylinder with a syringe and bleeding the lines again.
- Rusted or rounded bleed nipples: replace nipples or caliper if damaged; use penetrating oil and correct wrench to avoid rounding.
Maintenance tips specific to the Wolverine 350
- Inspect brake lines, hose clamps and banjo bolt washers for age-related deterioration; replace as preventive maintenance on older MMY models.
- Replace the reservoir diaphragm and cap gasket when you service the fluid — these are inexpensive parts that prevent contamination.
- Keep a maintenance log for brake fluid changes. For mixed trail and work use, change fluid every 1-2 years to avoid moisture buildup that lowers boiling point.
- If the ATV has been stored outdoors for long periods, inspect calipers and master cylinder for internal corrosion before relying on brakes in the field.
Follow these MotoSport procedures and safety checks to ensure your 1995 Yamaha Wolverine 350 braking system performs reliably. Perform a cautious test ride at low speed to verify braking performance before returning to normal riding.
Related Shopping Categories
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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.