How to bleed and replace brake fluid on a 2018 Suzuki King Quad 750AXi 4X4 POWER STEERING

Shop parts for a 2018 SUZUKI KINGQD750P ATV.

This MotoSport guide walks you step-by-step through flushing and bleeding the hydraulic brake system on a 2018 Suzuki King Quad 750AXi 4X4 POWER STEERING. Follow these procedures exactly to maintain safe braking performance. Work on a cool machine, on level ground, with the engine off unless otherwise noted. Wear eye protection and gloves.

What you need

  • Fresh DOT 4 brake fluid (confirm with your owner's manual; use only a clean, sealed container)
  • Brake bleeding kit or clear hose & catch bottle
  • Wrenches to fit bleeder nipples (open-end wrench)
  • Syringe or turkey-baster for reservoir removal
  • Clean lint-free rags and brake parts cleaner
  • Latex or nitrile gloves, safety glasses
  • Jack/stands or ramps to raise wheels if needed

Model notes — 2018 King Quad 750AXi 4X4 PS

  • The 750AXi uses hydraulic disc brakes front and rear and a centralized reservoir system accessible on the handlebar area. There is no factory ABS on this model.
  • The brake reservoir is compact & plastic; avoid overfilling. Keep the cap and diaphragm clean to prevent contamination.
  • Power steering is a separate system; do not confuse power steering fluid with brake fluid. Do not use brake fluid in the power steering system.
  • If you notice a soft lever/pedal after bleeding, recheck for air, leaking lines, or a failing master cylinder/caliper seal common on older units.

Preparation

  1. Park the ATV on level ground, set the parking brake, and disconnect the negative battery terminal if you will run the engine during a final bleed cycle.
  2. Clean the reservoir cap area thoroughly to prevent dirt entering the system when opened.
  3. Remove the reservoir cap and diaphragm; use a turkey-baster or syringe to extract as much old fluid as possible.
  4. Top the reservoir with fresh DOT 4 brake fluid to roughly the full mark. Do not reuse old fluid.
  5. Identify bleeder screws on each caliper. Typically bleed order is the farthest wheel from the master cylinder first: rear passenger, rear driver, front passenger, front driver. On single-lever ATV setups use the same left-to-right logic — confirm routing visually if uncertain.

Bleeding method: One-person (gravity or vacuum assist)

  1. Attach clear hose to caliper bleeder and place other end in a catch container with some fresh fluid to prevent air being drawn back.
  2. Loosen the bleeder screw about a quarter- to half-turn. If using a vacuum pump, connect it to the hose and draw until bubbles stop, then tighten the bleeder while holding vacuum.
  3. If using gravity bleed, leave the bleeder open and let fluid drip until the line runs clear with no air bubbles and the reservoir level remains above the minimum. Replenish reservoir as needed with clean fluid to avoid drawing air into the master cylinder.
  4. Tighten the bleeder screw to snug (avoid excessive torque). Wipe any spilled fluid immediatelyDOT fluid can damage paint and plastics.
  5. Repeat for each wheel in the correct sequence until each caliper outputs clear, bubble-free fluid and the lever/pedal feels firm.

Bleeding method: Two-person pump-and-hold

  1. Person A pumps the brake lever/pedal several times and holds it firmly.
  2. Person B opens the bleeder screw to let fluid and air escape, then closes it before Person A releases the lever/pedal.
  3. Repeat pump-hold-open-close cycles until no air is visible in the hose and the lever/pedal becomes firm. Keep reservoir topped between cycles.

Final steps

  • Once all calipers are clear, top the reservoir to the proper level, reinstall the diaphragm and cap securely.
  • Clean all fittings, remove tools, and torque bleeder screws snugly but avoid overtightening. Check for leaks at hoses, banjo bolts, and calipers.
  • If you ran the engine for power-assist feel checks, warm the brakes with a few slow controlled stops at low speed in a safe area to seat pads and verify firm pedal/lever response.
  • Dispose of old brake fluid responsibly; do not pour it down drains.

Troubleshooting & tips

  • Persistent spongy brakes after careful bleeding indicate either a leaking seal, damaged hose, or master cylinder problem. Inspect lines and components for wetness or swelling.
  • If you see foam or severe contamination in the reservoir, consider a full system flush by repeatedly drawing and replenishing fluid until clean at each bleeder.
  • Replace rubber hoses showing cracking or bulging. OEM-style banjo washers should be replaced when disturbed.
  • Record the service date and fluid type in your maintenance log. Brake fluid absorbs moisture over time; replace every 1-2 years depending on use and storage conditions.

Safety reminders

  • DOT brake fluid is hygroscopic and corrosive to painted surfaces. Clean spills immediately and store fluid sealed.
  • Never mix DOT 5 silicone fluid with DOT 3/4. Use only the type specified or recommended by MotoSport techs and the owner's manual.

Following this MotoSport procedure will keep the 2018 Suzuki King Quad 750AXi 4X4 POWER STEERING braking system reliable and safe. If you encounter internal master or caliper failure, consult a qualified technician or contact MotoSport for replacement parts and support.

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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.