How to Bleed & Replace Brake Fluid on a 2020 Suzuki King Quad 750AXi 4X4

Shop parts for a 2020 Suzuki King Quad 750AXi 4X4 ATV.

This step-by-step MotoSport guide walks you through draining, flushing, and bleeding the hydraulic brake system on a 2020 Suzuki King Quad 750AXi 4X4. Procedures emphasize safety, contamination control, and preserving painted & plastic surfaces. Keep this page handy in your shop or on your phone when working on your MMY ATV.

What you need

  • DOT-spec brake fluid (use the fluid specified in your owner’s manual; DOT 4 is commonly recommended for modern Suzuki hydraulic systems)
  • Clear plastic tubing that fits snugly over the bleed nipples
  • Brake-fluid collection bottle or a clear catch container with capacity markings
  • Hand or foot brake-bleeding pump OR vacuum bleeder OR 1-2 helper(s) for manual bleeding
  • Wrenches to fit bleed nipples (usually 8mm or 10mm)
  • Rags, rubber gloves, safety glasses
  • Small funnel or syringe for topping reservoir
  • Jack or ramps and stands to lift the ATV safely (wheel removal may be required)
  • Scotchbrite pad or brake cleaner for nipple threads and to clean spilled fluid

Model-specific notes for the 2020 King Quad 750AXi 4X4

  • The King Quad 750AXi uses hydraulic disc brakes front and rear. There is no factory ABS on this MMY model, so bleeding follows the conventional open-hydraulic sequence.
  • Master cylinder reservoir(s) are exposed at the handlebar area for the front lever and near the brake pedal for the rear circuit; confirm which reservoir supplies which caliper on your unit before you begin.
  • Brake fluid will damage painted plastics and metal finishes – cover body panels and clean spills immediately with brake cleaner and rags.
  • Use only fresh, unopened brake fluid from a sealed container to avoid moisture contamination. Replace both the fluid and bleed the entire circuit — topping up without a full flush preserves contaminants in the lines.
  • If the unit has aftermarket carrier racks or accessories near reservoirs or lines, check routing so hoses aren’t pinched during bleeding.

Prep & safety

  1. Park on a level surface, set the parking brake, remove the key, and disconnect the battery negative cable if you’ll be working near electrical components.
  2. Lift the ATV with the wheels off the ground using ramps or stands so wheels can turn freely. Securely chock and support the machine.
  3. Clean reservoir caps and surrounding area to keep dirt out when opened. Remove caps carefully and keep rags nearby.
  4. Inspect hose condition, calipers, rotors, and pads for wear before starting. Replace any components that show damage or leakage.

Drain & replace procedure (complete flush and bleed)

Follow the sequence below for a complete fluid replacement and proper bleeding. The priorities are to keep the reservoir level above the fluid line at all times and to bleed the furthest caliper from the master cylinder first. If you have two separate reservoirs (front lever and rear pedal), treat each circuit independently.

  1. Identify master cylinder to caliper relationships. Typically: rear caliper(s) are on the rear circuit; two front calipers share the front lever. Determine which caliper is farthest from its reservoir (usually a rear caliper or the right rear) and plan bleeding order accordingly.
  2. Top the reservoir with fresh brake fluid until near the MAX mark. Leave the cap loose but seated or cover with a clean rag to reduce contamination.
  3. Start at the farthest caliper: fit clear tubing over the bleed nipple and route it into your catch bottle. Loosen the nipple 1/2 to 3/4 turn; do not remove it.
  4. Method A – Manual two-person bleed:
    1. One person slowly squeezes the lever or pumps the pedal several times and holds it on the last stroke.
    2. While held, the second person opens the bleed nipple briefly to let fluid and air escape into the tubing, then closes the nipple before release. Repeat until clear, bubble-free fluid exits, then tighten the nipple to spec and move to the next caliper.
  5. Method B – Vacuum or pressure bleeder:
    1. Attach the vacuum pump or pressure reservoir to the bleed nipple or to the master reservoir per tool instructions. Vacuum at the caliper or pressure at the reservoir will pull fluid through the lines. Open each nipple until clear fluid flows, then close it before switching calipers.
  6. Bleed the remaining calipers moving progressively toward the master cylinder. For a four-wheel circuit common sequence example: right rear, left rear, right front, left front – but always confirm actual layout on your machine and adjust accordingly.
  7. Keep the reservoir topped between steps. Never let the reservoir run dry or you will introduce new air into the system and have to start over.
  8. After all calipers are clear, perform a final bleed pass (short bursts at each nipple) and verify lever/pedal firmness. Lever travel should be firm with minimal sponginess; pedal should not travel excessively.
  9. Torque the bleed nipple and hose fittings to factory specs if you removed hoses. Clean and reinstall reservoir caps securely when done.

Bench-bleeding the master cylinder (if removed)

If you remove the master cylinder for rebuild or replacement, bench-bleed before reinstalling: mount the cylinder in a vise or fixture, fill with fluid, and use short plastic tubes from the outlet ports back into the reservoir while actuating the piston until no bubbles appear. Install the master only after bench-bleeding is complete.

Testing & final checks

  • Lower the ATV and test brakes at low speed in a safe area. Confirm firm response and no brake fade or dragging.
  • Inspect for leaks around calipers, hoses, and fittings after a short test ride.
  • Re-check reservoir fluid level after a test ride and top to the correct level.
  • Properly dispose of used brake fluid per local hazardous-waste rules.

Troubleshooting tips

  • Persistent spongy lever/pedal: re-bleed entire circuit, paying special attention to the furthest calipers and any hose low points where air can collect.
  • Brake drag after bleeding: check caliper pistons and guide pins for corrosion or seized operation; pads may need cleaning or caliper servicing.
  • If you find foam or moisture in the fluid quickly after service, the new fluid may have been contaminated or an internal leak may be allowing air in — recheck seals and replace fluid again if necessary.

Maintenance intervals & MotoSport recommendations

  • Replace brake fluid every 1-2 years or according to your Suzuki owner’s manual to keep moisture content low and maintain brake performance.
  • Inspect lines and fittings annually; replace rubber hoses that show swelling, cracking, or soft spots.
  • MotoSport recommends keeping a spare set of bleed hose, replacement seals, and a quality DOT-spec fluid on hand for seasonal maintenance.

Follow these steps carefully and your 2020 Suzuki King Quad 750AXi 4X4 will have reliable, high-performance braking. If you’re unsure about any step, consult a certified technician or bring your ATV to a shop for professional service.

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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.