How to Bleed and Replace Brake Fluid on a 2009 Suzuki King Quad 450AXi 4X4
Shop parts for a 2009 Suzuki King Quad 450AXi 4X4 ATV.
This MotoSport-exclusive guide walks you through flushing and bleeding the hydraulic brake system on a 2009 Suzuki King Quad 450AXi 4X4. Follow each step carefully & observe safety precautions. Use DOT 4 brake fluid unless OEM specifies otherwise in your owner’s manual.
Tools & supplies
- DOT 4 brake fluid (new, unopened)
- Brake bleeder kit or clear tubing & catch bottle
- Wrenches: 8mm and 10mm commonly fit bleeder nipples
- Turkey baster or fluid suction pump
- Clean rags and gloves
- Jack or ramps & stands for wheel access
- Brake cleaner and small wire brush
- Torque wrench for caliper bolts if removed
Model-specific notes for the 2009 King Quad 450AXi
- The 450AXi uses a hydraulic front dual-disc and a rear single-disc brake setup with a small-capacity master cylinder reservoir mounted on the handlebar areakeep reservoir orientation upright during service.
- ABS is not present on this model year, simplifying bleeding to a standard sequential process.
- The master cylinder reservoir is plastic and prone to contamination; replace the cap O-ring if brittle and clean the reservoir before refilling.
- Caliper bleed nipples are small and can corrode — apply a penetrating spray and tap lightly if stuck, then clean threads before opening to avoid contamination.
- Brake hoses are OEM-rated; inspect for cracks, soft spots, or bulges. If present, replace hoses rather than just fluid.
Preparation
- Park on level ground, engage parking brake, remove ignition key.
- Raise the ATV and support securely to access wheels if necessary. Remove wheels for easier caliper access if desired.
- Clean around the master cylinder cap & bleed nipples to avoid introducing dirt into the system.
- Open the master cylinder cap and top off with fresh DOT 4 fluid so system starts full; do not reuse drained fluid.
- Have rags underneath components to catch drips and protect painted surfaces from fluid — brake fluid damages paint.
Bleeding sequence overview
Standard sequence for King Quad 450AXi: start with the brake caliper furthest from the master cylinder and proceed to the nearest. For most setups on this model: rear caliper, then right front, then left front. Confirm master cylinder location and line routing visually before starting.
Step-by-step bleed & replacement
- Remove as much old fluid from the master reservoir as possible using a turkey baster. Wipe the inside with a clean lint-free cloth if contaminated.
- Refill reservoir with fresh DOT 4 to the MAX mark.
- Attach clear tubing to the rear caliper bleed nipple; place the other end in a catch bottle partially filled with fresh fluid to avoid drawing air back in.
- Have an assistant pump the brake lever/pedal slowly several times and then hold pressure. Open the rear bleed nipple one quarter turn to let fluid & air out, then close before the assistant releases pressure. Repeat until fluid runs clear with no bubbles. Keep reservoir topped up between cycles.
- Move to the front right caliper and repeat the same pump-hold-open-close cycles until clear fluid appears and no air bubbles are present.
- Finish at the front left caliper using the same method.
- Throughout the process, monitor reservoir level closely — do not let it go below the minimum line or you will reintroduce air into the system.
- When bleeding is complete, tighten bleed nipples to specified snug torque (light hand torque is typical; avoid stripping). Wipe any spilled fluid and replace the master cylinder cap with a clean O-ring.
- Pump brakes with ATV on the ground and wheels installed. Confirm firm pedal/lever feel and inspect for leaks at all fittings, hoses, calipers & master cylinder.
- Properly dispose of used brake fluid according to local regulations.
Checks & adjustments after bleeding
- Test ride at low speed in a safe area to verify braking performance — brakes should engage firmly with no sponginess.
- If pedal/lever is soft, repeat bleeding cycle or inspect for air entry points and leaking components.
- Inspect rotor pads for contamination. If fluid touched pads, replace pads and clean rotors with brake cleaner.
- Re-torque wheel nuts to factory spec after a short initial ride if wheels were removed.
Troubleshooting
- Persistent spongy feel: likely trapped air or a leaking master cylinder/line. Pressure-bleed systems or replacing the master cylinder may be necessary.
- Corroded bleeder nipples: replace caliper or nipples and clean threads before reinstalling.
- Contaminated reservoir or old rubber components: replace rubber seals, hoses, and consider a new master cylinder cap O-ring.
Safety & final tips
- Use only DOT 4 fluid. Mixing fluid types can damage seals and reduce performance.
- Wear gloves and eye protection; brake fluid is corrosive to skin & paint.
- Keep work area clean & organized. Brake systems are critical to safetyif unsure, consult a qualified mechanic.
- Record the service date & mileage. Replace brake fluid every 1-2 years or according to heavy use conditions.
Perform the service methodically & inspect related components while you're working. Proper maintenance keeps the King Quad 450AXi stopping reliably season after season.
Related Shopping Categories
Shop Brake Fluid for a 2009 Suzuki King Quad 450AXi 4X4 ATV.
Shop Brake Bleeders for a 2009 Suzuki King Quad 450AXi 4X4 ATV.
Shop Brake Pads for a 2009 Suzuki King Quad 450AXi 4X4 ATV.
Shop Brake Lines for a 2009 Suzuki King Quad 450AXi 4X4 ATV.
Shop Brake Tools for a 2009 Suzuki King Quad 450AXi 4X4 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.
